Material standard of living, social class, and the prevalence of the common mental disorders in Great Britain

Bypassing the selection rule in choosing controls for a case-control study

OBJECTIVES

It has been argued that in case-control studies, controls should be drawn from the base population that gives rise to the cases. In designing a study of occupational injury and risks arising from long-term illness and prescribed medication, we lacked data on subjects' occupation, without which employed cases (typically in manual occupations) would be compared with controls from the general population, including the unemployed and a higher proportion of white-collar professions. Collecting the missing data on occupation would be costly. We estimated the potential for bias if the selection rule were ignored.

METHODS

We obtained published estimates of the frequencies of several exposures of interest (diabetes, mental health problems, asthma, coronary heart disease) in the general population, and of the relative risks of these diseases in unemployed versus employed individuals and in manual versus non-manual occupations. From these we computed the degree of over- or underestimation of exposure frequencies and exposure ORs if controls were selected from the general population.

RESULTS

The potential bias in the OR was estimated as likely to fall between an underestimation of 14% and an overestimation of 36.7% (95th centiles). In fewer than 6% of simulations did the error exceed 30%, and in none did it reach 50%.

CONCLUSIONS

For the purposes of this study, in which we were interested only in substantial increases in risk, the potential for selection bias was judged acceptable. The rule that controls should come from the same base population as cases can justifiably be broken, at least in some circumstances.

Who is accessing public-sector anti-retroviral treatment in the Free State, South Africa? An exploratory study of the first three years of programme implementation

Background

Although South Africa has the largest public-sector anti-retroviral treatment (ART) programme in the world, anti-retroviral coverage in adults was only 40.2% in 2008. However, longitudinal studies of who is accessing the South African public-sector ART programme are scarce. This study therefore had one main research question: who is accessing public-sector ART in the Free State Province, South Africa? The study aimed to extend the current literature by investigating, in a quantitative manner and using a longitudinal study design, the participants enrolled in the public-sector ART programme in the period 2004-2006 in the Free State Province of South Africa.

Methods

Differences in the demographic (age, sex, population group and marital status) socio-economic (education, income, neo-material indicators), geographic (travel costs, relocation for ART), and medical characteristics (CD4, viral load, time since first diagnosis, treatment status) among 912 patients enrolled in the Free State public-sector ART programme between 2004 and 2006 were assessed with one-way analysis of variance, Bonferroni post-hoc analysis, and cross tabulations with the chi square test.

Results

The patients accessing treatment tended to be female (71.1%) and unemployed (83.4%). However, although relatively poor, those most likely to access ART services were not the most impoverished patients. The proportion of female patients increased (P < 0.05) and their socio-economic situation improved between 2004 and 2006 (P < 0.05). The increasing mean transport cost (P < 0.05) to visit the facility is worrying, because this cost is an important barrier to ART uptake and adherence. Encouragingly, the study results revealed that the interval between the first HIV-positive diagnosis and ART initiation decreased steadily over time (P < 0.05). This was also reflected in the increasing baseline CD4 cell count at ART initiation (P < 0.05).

Conclusions

Our analysis showed significant changes in the demographic, socio-economic, geographic, and medical characteristics of the patients during the first three years of the programme. Knowledge of the characteristics of these patients can assist policy makers in developing measures to retain them in care. The information reported here can also be usefully applied to target patient groups that are currently not reached in the implementation of the ART programme.

Influence of population and general practice characteristics on prescribing of minor tranquilisers in primary care

Prevalence of generalised anxiety disorders is widespread in Great Britain. Previous small-scale research has shown variations in minor tranquiliser prescribing, identifying several potential predictors of prescribing volume.

OBJECTIVE

This study aimed to investigate the relationship between general practice minor tranquiliser prescribing rates and practice population and general practice characteristics for all general practices in England.

METHODS

Multiple regression analysis of minor tranquiliser prescribing volumes during 2004/2005 for 8,291 English general practices with general practice and population variables obtained from the General Medical Services (GMS) statistics, Quality and Outcomes Framework (QOF), 2001 Census and 2004 Index of Multiple Deprivation (IMD).

RESULTS

The highest rates of minor tranquiliser prescribing were in areas with the greatest local deprivation while general practices situated in areas with larger proportions of residents of black ethnic origin had lower rates of prescribing. Other predictors of increased prescribing were general practices with older general practitioners and general practices with older registered practice populations.

CONCLUSION

Our findings show that there is wide variation of minor tranquilisers prescribing across England which has implications regarding access to treatment and inequity of service provision. Future research should determine the barriers to equitable prescribing amongst general practices serving larger populations of black ethnic origin.

Socioeconomic inequalities in general and psychological health among adolescents: a cross-sectional study in senior high schools in Greece

BACKGROUND

Socioeconomic health inequalities in adolescence are not consistently reported. This may be due to the measurement of self-reported general health, which probably fails to fully capture the psychological dimension of health, and the reliance on traditional socio-economic indicators, such as parental education or occupational status. The present study aimed at investigating this issue using simple questions to assess both the physical and psychological dimension of health and a broader set of socioeconomic indicators than previously used.

METHODS

This was a cross-sectional survey of 5614 adolescents aged 16-18 years-old from 25 senior high schools in Greece. Self-reported general and psychological health were both measured by means of a simple Likert-type question. We assessed the following socio-economic variables: parents' education, parents' employment status, a subjective assessment of the financial difficulties experienced by the family and adolescents' own academic performance as a measure of the personal social position in the school setting.

RESULTS

One out of ten (10%) and one out of three (32%) adolescents did not enjoy good general and psychological health respectively. For both health variables robust associations were found in adolescents who reported more financial difficulties in the family and had worse academic performance. The latter was associated with psychological health in a more linear way. Father's unemployment showed a non-significant trend for an association with worse psychological health in girls only.

CONCLUSIONS

Socioeconomic inequalities exist in this period of life but are more easily demonstrated with more subjective socioeconomic indicators, especially for the psychological dimension of health.

Economic difficulties and common mental disorders among Finnish and British white-collar employees: the contribution of social and behavioural factors

BACKGROUND

In addition to conventional indicators of socioeconomic position, material conditions such as economic difficulties are associated with mental health. However, there has been little investigation of these associations. This study aims to examine the association of current economic difficulties with common mental disorders (CMD) and the contribution of social and behavioural factors to this association in two cohorts of Finnish and British white-collar employees.

METHODS

Comparable survey data from the Finnish Helsinki Health Study and the British Whitehall II Study were used. CMD were measured with the GHQ-12. Inequality indices from logistic regression analysis were used to examine the association between current economic difficulties and CMD, and the contribution of other past and present socioeconomic circumstances, health behaviours, living arrangements and work-family conflicts to this association. Inequality indices show the average change in ill health for each step up in the level of economic difficulties. Analyses were conducted separately for men and women.

RESULTS

Clear associations between current economic difficulties and CMD were found. Adjusting for work-family conflicts attenuated the associations. Adjusting for indicators of past and present socioeconomic circumstances, health behaviours and living arrangements had generally negligible effects. The results were very similar among both sexes in the two cohorts.

CONCLUSIONS

Conflicts between work and family contribute to the association between economic difficulties and CMD in both Finland and Britain. Supporting people to cope not only with everyday economic difficulties but also with work-family conflicts may be important for reducing inequalities in mental health.

A longitudinal study of blood folate levels and depressive symptoms among young women in the Southampton Women's Survey

BACKGROUND

Lower blood folate levels have been associated with depression in cross-sectional surveys, but no studies have examined the relationship prospectively to determine whether the relationship is causal. A follow-up study was designed to examine whether lower blood folate levels predict incident depressive symptoms.

METHOD

Women aged 20-34 years registered in general practices in Southampton, UK, were asked to participate. Baseline assessment included the general health questionnaire (GHQ-12) measure of anxiety and depression, and socioeconomic factors, diet, smoking and alcohol intake. Two years later, participants' general practice (GP) records were examined for evidence of incident symptoms of depression.

RESULTS

At baseline, 5051 women completed the GHQ-12 and had red cell folate levels measured, of whom 1588 (31.4%) scored above the threshold for case level symptoms of anxiety and depression on the GHQ-12. Two years later, GP records for 3996 (79.1%) were examined, but 1264 with baseline evidence of depression were excluded from follow-up analysis. Incident depressive symptoms were recorded for 307 (11.2%) of the remaining 2732. Lower red cell folate levels were associated with caseness on the GHQ-12 (adjusted prevalence ratio 0.99 per 100 nmol/l red cell folate, 95% CI 0.98 to 1.00). No relationship was found between red cell folate levels and incident depressive symptoms over 2 years (adjusted hazard ratio 1.00, 95% CI 0.97 to 1.03).

CONCLUSIONS

Low folate levels were not associated with subsequent depressive symptoms. This suggests that lower blood folate levels may be a consequence rather than a cause of depressive symptoms.

Debt, income and mental disorder in the general population

BACKGROUND

The association between poor mental health and poverty is well known but its mechanism is not fully understood. This study tests the hypothesis that the association between low income and mental disorder is mediated by debt and its attendant financial hardship.

METHOD

The study is a cross-sectional nationally representative survey of private households in England, Scotland and Wales, which assessed 8580 participants aged 16-74 years living in general households. Psychosis, neurosis, alcohol abuse and drug abuse were identified by the Clinical Interview Schedule--Revised, the Schedule for Assessment in Neuropsychiatry (SCAN), the Alcohol Use Disorder Identification Test (AUDIT) and other measures. Detailed questions were asked about income, debt and financial hardship.

RESULTS

Those with low income were more likely to have mental disorder [odds ratio (OR) 2.09, 95% confidence interval (CI) 1.68-2.59] but this relationship was attenuated after adjustment for debt (OR 1.58, 95% CI 1.25-1.97) and vanished when other sociodemographic variables were also controlled (OR 1.07, 95% CI 0.77-1.48). Of those with mental disorder, 23% were in debt (compared with 8% of those without disorder), and 10% had had a utility disconnected (compared with 3%). The more debts people had, the more likely they were to have some form of mental disorder, even after adjustment for income and other sociodemographic variables. People with six or more separate debts had a six-fold increase in mental disorder after adjustment for income (OR 6.0, 95% CI 3.5-10.3).

CONCLUSIONS

Both low income and debt are associated with mental illness, but the effect of income appears to be mediated largely by debt.

Predicting the onset and persistence of episodes of depression in primary health care. The predictD-Spain study: methodology

BACKGROUND

The effects of putative risk factors on the onset and/or persistence of depression remain unclear. We aim to develop comprehensive models to predict the onset and persistence of episodes of depression in primary care. Here we explain the general methodology of the predictD-Spain study and evaluate the reliability of the questionnaires used.

METHODS

This is a prospective cohort study. A systematic random sample of general practice attendees aged 18 to 75 has been recruited in seven Spanish provinces. Depression is being measured with the CIDI at baseline, and at 6, 12, 24 and 36 months. A set of individual, environmental, genetic, professional and organizational risk factors are to be assessed at each follow-up point. In a separate reliability study, a proportional random sample of 401 participants completed the test-retest (251 researcher-administered and 150 self-administered) between October 2005 and February 2006. We have also checked 118,398 items for data entry from a random sample of 480 patients stratified by province.

RESULTS

All items and questionnaires had good test-retest reliability for both methods of administration, except for the use of recreational drugs over the previous six months. Cronbach's alphas were good and their factorial analyses coherent for the three scales evaluated (social support from family and friends, dissatisfaction with paid work, and dissatisfaction with unpaid work). There were 191 (0.16%) data entry errors.

CONCLUSION

The items and questionnaires were reliable and data quality control was excellent. When we eventually obtain our risk index for the onset and persistence of depression, we will be able to determine the individual risk of each patient evaluated in primary health care.

Does perceived financial strain predict depression among young women? Longitudinal findings from the Southampton Women's Survey

Background Social and financial environment has an influence on the incidence of depression. We studied perceived financial strain as a risk factor for development of depression among a large cohort of young women in Southampton, UK.Methods We recruited a large number of young women in Southampton in the Southampton Women's Survey, a longitudinal study looking at factors influencing the health of women and their offspring. Women were asked to complete a baseline questionnaire, which included the GHQ-12 (an assessment of mental health), as well as questions on perceived financial strain and past history of depression. They were followed up two years later through their general practitioner (GP) records for evidence of incident mental illness.Results A total of 7020 women completed the baseline questionnaire including the GHQ-12. Of these, 5237 (74.6%) had records available for follow-up. Among those developing depression, there was a higher proportion receiving benefits, and a higher level of perceived financial strain. There were also modest elevations in perceived stress, and poorer levels of educational attainment. Among women not depressed at baseline, and with no previous history of depression, those in receipt of state benefits at baseline had a significantly elevated risk of developing the disorder - hazard ratio 1.61 (95% confidence interval (CI) 1.13-2.3). The risk associated with perceived financial strain was 2.16 (95% CI 1.14-4.11), but this did not remain statistically significant after adjustment was made for receipt of benefits, educational qualification, and perceived stress.Conclusion Financial hardship as evidenced by receipt of benefits is a strong independent predictor for the development of depression. Although perception of financial strain is also a predictor for incident depression, the risk associated with this subjective characteristic does not remain significantly elevated after adjustment. Future studies of the aetiology of depression should incorporate ascertainment of actual financial status.

Short-term physical and emotional health outcomes of public sector ART in the Free State province of South Africa

INTRODUCTION

In order to assess the health outcomes of the South African public sector antiretroviral treatment (ART) programme, it is important to gain a better understanding of the complex relationship between ART and the multidimensional construct quality of life (QoL). Because of the gap between supply and demand, equity issues arise concerning the provisioning of ART.

OBJECTIVE

The aim of this paper is to examine how and to what extent public sector ART is related to the physical and emotional health of people living with HIV/AIDS (PLWHA).

METHODS

The stratified random sample consisted of 371 AIDS patients on ART or medically certified for ART, but still awaiting treatment. A model of the relationships between patient characteristics (age and gender) and socio-economic position (educational level, income, type of dwelling, number of rooms), ART duration, and physical and emotional QoL was tested using structural equation modelling.

RESULTS

Patients with a higher personal income (beta = .19, P < .05) and a larger dwelling (beta = .45, P < .01) were significantly more likely to enter the programme at this early stage. The model showed that the initial months of ART have been associated with significant improvements in the physical QoL (beta = .21, P < .01). Furthermore, patients on ART reported significantly higher levels of emotional well-being than patients awaiting treatment (beta = .10, P < .01). Finally, the results indicate that ART is not only directly associated with emotional QoL, but is also indirectly associated with emotional QoL via the mediating variable physical QoL (beta = .30, P < .01).

CONCLUSIONS

The study suggests that the poorest of the poor are not the first beneficiaries of the public programme. Most importantly, the present findings demonstrate the positive physical and emotional health outcomes of the first 6 months of ART in the Free State, South Africa.

Socioeconomic status and perinatal outcomes in a setting with universal access to essential health care services

BACKGROUND

The health care system in Canada provides essential health services to all women irrespective of socioeconomic status. Our objective was to determine whether perinatal and infant outcomes varied by family income and other socioeconomic factors in this setting.

METHODS

We included all 92,914 women who delivered in Nova Scotia between 1988 and 1995 following a singleton pregnancy. Family income was obtained for 76,440 of these women through a confidential link to income tax records and was divided into 5 groups. Outcomes studied included pregnancy complications, preterm birth, small-for-gestational-age live birth, perinatal death, serious neonatal morbidity, postneonatal death and infant death. Logistic regression models were used to adjust for potential confounders.

RESULTS

Compared with women in the highest family income group, those in the lowest income group had significantly higher rates of gestational diabetes (crude rate ratio [RR] 1.44, 95% confidence interval [CI] 1.21-1.73), preterm birth (crude RR 1.20, 95% CI 1.06-1.35), small-for-gestational-age live birth (crude RR 1.81, 95% CI 1.66-1.97) and postneonatal death (crude RR 5.54, 95% CI 2.21-13.9). The opposite was true for rates of perinatal death (crude RR 0.74, 95% CI 0.56-0.96), and there was no significant difference between the 2 groups in the composite of perinatal death or serious neonatal morbidity (crude RR 1.01, 95% CI 0.82-1.24). Adjustment for behavioural and lifestyle factors accentuated or attenuated socioeconomic differences.

INTERPRETATION

Lower family income is associated with increased rates of gestational diabetes, small-for-gestational-age live birth and postneonatal death despite health care services being widely available at no out-of-pocket expense.

Describing depression: ethnicity and the use of somatic imagery in accounts of mental distress

Past research has suggested that there are significant differences in the prevalence and progress of anxiety and depression in different ethnic groups in England and that patterns of help seeking also differ. In parallel, research has also reported distinctive differences in the language and representations of mental distress across different ethnic groups. Differences both in the expression of depression and underlying conceptual models of mental health and illness may be part of the explanation for different patterns of help seeking, as the accounts people give of their experience of health and illness, including the meaning they attach to symptoms and signs for example, have been shown to be an important mediator of the action they take to protect their health or to respond to ill health. In this paper we will use evidence from recent mixed-method research with people of Pakistani origin and white people living in a locality in northwest England to explore the constructions and representations of mental distress, and in particular the physical imagery and 'somatic metaphors' of narratives used by our respondents, and consider how these data might illuminate debates about the experience of mental ill health and help-seeking practices.

Socioeconomic circumstances and common mental disorders among Finnish and British public sector employees: evidence from the Helsinki Health Study and the Whitehall II Study

BACKGROUND

Common mental disorders do not always show as consistent socioeconomic gradients as severe mental disorders and physical health. This inconsistency may be due to the multitude of socioeconomic measures used and the populations and national contexts studied. We examine the associations between various socioeconomic circumstances and common mental disorders among middle-aged Finnish and British public sector employees.

METHODS

We used survey data from the Finnish Helsinki Health Study (n = 6028) and the British Whitehall II Study (n = 3116). Common mental disorders were measured by GHQ-12. The socioeconomic indicators were parental education, childhood economic difficulties, own education, occupational class, household income, housing tenure and current economic difficulties. Logistic regression analysis was the main statistical method used.

RESULTS

Childhood and current economic difficulties were strongly associated with common mental disorders among men and women in both the Helsinki and the London cohort. The more conventional indicators of socioeconomic circumstances showed weak or inconsistent associations. Differences between the two cohorts and two genders were small.

CONCLUSIONS

Our findings emphasize the importance of past and present economic circumstances to common mental disorders across different countries and genders. Overall, our results suggest that among employee populations, the socioeconomic patterning of common mental disorders may differ from that of other domains of health.

Have urban/rural inequalities in suicide in New Zealand grown during the period 1980-2001?

Previous studies have noted that in many countries there has been a disproportionate increase in suicide in rural areas, contributing to greater urban/rural inequalities in health. This paper evaluates whether this trend was also apparent in New Zealand during the 1980s and 1990s, a period of rapid social and economic change. Using suicide incidence data for the period 1980-2001, we investigate whether urban/rural status had an effect upon rates of suicide independently of socioeconomic deprivation. While both male and female suicide rates were significantly higher in urban than rural areas in 1980-1982, by the end of the 1990s, urban/rural differences in suicide rates were not significant. The narrowing of urban/rural differences was, to some extent, a result of the growth in suicide rates in more isolated rural communities and small rural service centres. Recent geographical variations in suicide in New Zealand are therefore to a large extent similar to trends observed elsewhere, but are less marked. Potential explanations are offered for the fluctuating urban/rural inequalities in suicide including compositional arguments, rural restructuring and economic decline, social isolation and health service utilisation.

Depression and socio-economic risk factors: 7-year longitudinal population study

BACKGROUND

Low socio-economic status is associated with a higher prevalence of depression, but it is not yet known whether change in socio-economic status leads to a change in rates of depression.

AIMS

To assess whether longitudinal change in socio-economic factors affects change of depression level.

METHOD

In a prospective cohort study using the annual Belgian Household Panel Survey (1992-1999), depression was assessed using the Global Depression Scale. Socio-economic factors were assessed with regard to material standard of living, education, employment status and social relationships.

RESULTS

A lowering in material standard of living between annual waves was associated with increases in depressive symptoms and caseness of major depression. Life circumstances also influenced depression. Ceasing to cohabit with a partner increased depressive symptoms and caseness, and improvement in circumstances reduced them; the negative effects were stronger than the positive ones.

CONCLUSIONS

The study showed a clear relationship between worsening socio-economic circumstances and depression.

The effects of economic deprivation on psychological well-being among the working population of Switzerland

BACKGROUND

The association between poverty and mental health has been widely investigated. There is, however, limited evidence of mental health implications of working poverty, despite its representing a rapidly expanding segment of impoverished populations in many developed nations. In this study, we examined whether working poverty in Switzerland, a country with substantial recent growth among the working poor, was correlated with two dependent variables of interest: psychological health and unmet mental health need.

METHODS

This cross-sectional study used data drawn from the first 3 waves (1999-2001) of the Swiss Household Panel, a nationally representative sample of the permanent resident population of Switzerland. The study sample comprised 5453 subjects aged 20-59 years. We used Generalized Estimating Equation models to investigate the association between working poverty and psychological well-being; we applied logistic regression models to analyze the link between working poverty and unmet mental health need. Working poverty was represented by dummy variables indicating financial deficiency, restricted standard of living, or both conditions.

RESULTS

After controlling other factors, restricted standard of living was significantly (p < .001) negatively correlated with psychological well-being; it was also associated with approximately 50% increased risk of unmet mental health need (OR = 1.55; 95% CI 1.17-2.06).

CONCLUSION

The findings of this study contribute to our understanding of the potential psychological impact of material deprivation on working Swiss citizens. Such knowledge may aid in the design of community intervention programs to help reduce the individual and societal burdens of poverty in Switzerland.

Socio-economic position and common mental disorders. Longitudinal study in the general population in the UK

BACKGROUND

Individuals in lower socio-economic groups have an increased prevalence of common mental disorders.

AIMS

To investigate the longitudinal association between socio-economic position and common mental disorders in a general population sample in the UK.

METHOD

Participants (n=2406) were assessed at two time points 18 months apart with the Revised Clinical Interview Schedule. The sample was stratified into two cohorts according to mental health status at baseline.

RESULTS

None of the socio-economic indicators studied was significantly associated with an episode of common mental disorder at follow-up after adjusting for baseline psychiatric morbidity. The analysis of separate diagnostic categories showed that subjective financial difficulties at baseline were independently associated with depression at follow-up in both cohorts.

CONCLUSIONS

These findings support the view that apart from objective measures of socio-economic position, more subjective measures might be equally important from an aetiological or clinical perspective.

Mental health, places and people: a multilevel analysis of economic inactivity and social deprivation

Using data on 24,975 respondents to the Welsh Health Survey 1998 aged 17-74 years, we investigated associations between individual mental health status measured using the SF-36 instrument, social class, economic inactivity and the electoral division Townsend deprivation score. In a multilevel modelling analysis, we found mental health was significantly associated with the Townsend score after adjusting for composition, and this effect was strongest in respondents who were economically inactive. Further contextual effects were shown by significant random variability in the slopes of the relation between mental health and economic inactivity at the electoral division level. Our results suggest that the places in which people live affect their mental health, supporting NHS policy that multi-agency planning to reduce inequalities in mental health status should address the wider determinants of health, as well as services for individual patients.

Multiple measures of socioeconomic circumstances and common mental disorders

While serious mental disorders typically show socioeconomic differences similar to physical illness-that is, that lower positions imply poorer health-differences for common mental disorders have been inconsistent. We aim to clarify the associations and pathways between measures of socioeconomic circumstances and common mental disorders by simultaneously analysing several past and present socioeconomic measures. The data were derived from middle-aged women and men employed by the City of Helsinki. Cross-sectional surveys were conducted in 2000-2002 among employees who, during each year, reached 40, 45, 50, 55 or 60 years of age. The pooled data include 8970 respondents (80% women; response rate 67%). Common mental disorders were measured by GHQ-12 and the SF-36 mental component summary. Seven socioeconomic measures were included: parental education, childhood economic difficulties, own education, occupational class, household income, home ownership, and current economic difficulties. Logistic regression analysis was used to examine associations between the socioeconomic circumstances and common mental disorders. Past and present economic difficulties were strongly associated with common mental disorders, whereas conventional past and present socioeconomic status measures showed weak or slightly reverse associations. Adjusting for age and gradually for each socioeconomic measure did not affect the main findings, which were very similar for women and men, as well as for both measures of common mental disorders. While the associations of conventional socioeconomic status measures with common mental disorders were weak and inconsistent, our results highlight the importance of past and present economic difficulties to these disorders.

Rural suicide--people or place effects?

OBJECTIVE

To examine factors that may contribute to elevated rates of suicide among rural communities in Australia.

METHOD

A wide-ranging literature search reviewed possible factors that may contribute to the geographical variation in suicide. Literature was organized to enable examination of compositional and contextual explanations, as well as collective social functioning and social practices.

RESULTS

A variety of factors may contribute to elevated rates of suicide in rural compared with urban areas. Collective and contextual (place) factors seem to be of particular importance as possible contributors to the elevated rate of suicide among rural males. These include rural socioeconomic decline; facilitators and barriers to service utilization such as service availability and accessibility, rural culture, community attitudes to mental illness and help seeking; and exposure to firearms.

CONCLUSIONS

Compositional, contextual and collective factors are hypothesized to influence the elevated rate of suicide in rural compared with urban areas. These factors need to be tested in empirical studies that consider both individual and community-based risk factors, and are designed to enable exploration of likely within-rural differences.

Prediction of depression in European general practice attendees: the PREDICT study

BACKGROUND

Prevention of depression must address multiple risk factors. Estimating overall risk across a range of putative risk factors is fundamental to prevention of depression. However, we lack reliable and valid methods of risk estimation. This protocol paper introduces PREDICT, an international research study to address this risk estimation.

METHODS/DESIGN

This is a prospective study in which consecutive general practice attendees in six European countries are recruited and followed up after six and 12 months. Prevalence of depression is assessed at baseline and each follow-up point. Consecutive attendees between April 2003 and September 2004 who were aged 18 to 75 were asked to take part. The possibility of a depressive episode was assessed using the Depression Section of the Composite International Diagnostic Interview. A selection of presumed risk factors was based on our previous work and a systematic review of the literature. It was necessary to evaluate the test-retest reliability of a number of risk factor questions that were developed specifically, or adapted, for the PREDICT study. In a separate reliability study conducted between January and November 2003, consecutive general practice attendees in the six participating European countries completed the risk factor items on two occasions, two weeks apart. The overall response rate at entry to the study was 69%. We exceeded our expected recruitment rate, achieving a total of 10,048 people in all. Reliability coefficients were generally good to excellent.

DISCUSSION

Response rate to follow-up in all countries was uniformly high, which suggests that prediction will be based on almost a full cohort. The results of our reliability analysis are encouraging and suggest that data collected during the course of PREDICT will have a satisfactory level of stability. The development of a multi-factor risk score for depression will lay the foundation for future research on risk reduction in primary care. Our data will also provide the necessary evidence base on which to develop and evaluate interventions to reduce the prevalence of depression.

Local neighbourhood and mental health: Evidence from the UK

This paper examines the association between neighbourhood and levels and changes in common mental disorders. Using data from a large scale nationally representative survey of individuals and households (the British Household Panel Survey), it locates individuals in their local neighbourhoods. These are defined as the nearest 500-800 persons centered around each individual in the survey. These 'bespoke' neighbourhoods are characterised according to five dimensions--disadvantage, mobility, age, ethnicity and urbanness--derived from factor analysis of the census characteristics of the residents of neighbourhoods in 1991. These dimensions measure characteristics of place that have been argued to be associated with mental ill health. The paper estimates multilevel models of the level and 5-year changes of common mental disorders (measured by the twelve item version of the General Health Questionnaire). Three and two level models are estimated, all of which allow for individual and household characteristics that may act as confounders of any neighbourhood effect. The results show the extent of association between neighbourhood and both levels and changes in mental health is limited. Less than one percent of the variance across individuals is at the neighbourhood level. The neighbourhood characteristics are not generally statistically associated with levels or changes in mental ill health. There is some evidence of interaction between neighbourhood characteristics and gender and ethnicity, but while statistically significant these interactions are small in size compared to the main effects of individual and household characteristics. What appears to be important for levels of common mental disorders are the observed characteristics of individuals and their households, not of place.

The distribution of the common mental disorders: social inequalities in Europe

BACKGROUND

The social class distribution of the common mental disorders (mostly anxiety and/or depression) has been in doubt until recently. This paper reviews the evidence of associations between the prevalence of the common mental disorders in adults of working age and markers of socio-economic disadvantage.

METHODS

Work is reviewed which brings together major population surveys from the last 25 years, together with work trawling for all European population studies. Data from more recent studies is examined, analysed and discussed. Because of differences in methods, instruments and analyses, little can be compared precisely, but internal associations can be examined.

FINDINGS

People of lower socio-economic status, however measured, are disadvantaged, and this includes higher frequencies of the conditions now called the 'common mental disorders' (mostly non-psychotic depression and anxiety, either separately or together). In European and similar developed populations, relatively high frequencies are associated with poor education, material disadvantage and unemployment.

CONCLUSION

The large contribution of the common mental disorders to morbidity and disability, and the social consequences in working age adults would justify substantial priority being given to addressing mental health inequalities, and deprivation in general, within national and European social and economic policy.

Is there a link between rates of common mental disorder and deficits in social capital in Gospel Oak, London?

Previous research in Gospel Oak indicates high-rates of common mental disorder. This paper explores how far deficits in social capital may be linked to these rates. Interviews, focus groups and participant observation were conducted to assess social capital in Gospel Oak from the phenomenological experience of residents. The data suggested that most residents perceived the neighbourhood to be rich in well-developed facilities, services and associational activity. Residents also generally expressed satisfaction with local trust and reciprocity. The results do not support the hypothesis that rates of common mental disorder in Gospel Oak are linked to deficits in social capital. Compositional factors may be more important in accounting for these rates.

Carer distress: A prospective, population-based study

This study investigates whether transitions into and out of unpaid caregiving are associated with increased risk for onset of or delayed recovery from psychological distress, and traces the prevalence of distress across successive years of caring activity and after caregiving has ceased. The analysis is based on data from the British Household Panel Survey covering 3000 would-be carers, 2900 former carers, and 11,100 non-carers during the 1990s; their psychological well-being was assessed at annual intervals using the General Health Questionnaire. Carers providing long hours of care over extended spells present raised levels of distress, women more so than men. Compared with non-carers, risk for onset of distress increases progressively with the amount of time devoted to caregiving each week. Adverse effects on the psychological well-being of heavily involved carers are most pronounced around the start of their care episodes and when caregiving ends. Ongoing care increases their susceptibility to recurring distress, and adverse health effects are evident beyond the end of their caregiving episodes. Several groups of carers experience psychological health inequalities compared with non-carers, especially those looking after a spouse or partner, and mothers caring for a sick or disabled child. The findings underline the importance for effective carer support and health promotion of early identification of carers, monitoring high risk groups, timing appropriate interventions, and targeting resources.

A survey of psychological wellbeing in an adult population

The British government has called on all NHS staff to help promote good psychological wellbeing in the population. This article reports results from a survey conducted in Merseyside, England, into the prevalence of poor psychological wellbeing across a large part of the region. People registered with one of five Merseyside primary care trusts were stratified by age group and deprivation, and a questionnaire was mailed to 28,000 who had been randomly selected from those aged 15 or over. A total of 11,168 (45%) completed questionnaires were returned. Of these, 2,442 (21.9%) respondents rated their psychological wellbeing as fairly poor or very poor. Mean levels of psychological wellbeing were significantly worse in a number of readily identifiable groups within the population, but overall, the lowest wellbeing ratings were concentrated in the most socioeconomically deprived quartile. We make a number of practical suggestions for the role of the community nurse in promoting good psychological wellbeing in patients. We also highlight our finding that socioeconomic deprivation was strongly associated with poor psychological wellbeing, which was in turn associated with a lifestyle high in risk factors for non-communicable diseases.

Help-seeking behaviour in men and women with common mental health problems: cross-sectional study

BACKGROUND

Many people with mental health problems do not seek professional help but their use of other sources of help is unclear.

AIMS

To investigate patterns of lay and professional help-seeking in men and women aged 16-64 years in relation to severity of symptoms and socio-demographic variables.

METHOD

Postal questionnaire survey, including the 12-item General Health Questionnaire (GHQ-12), sent to a stratified random sample (n=15,222) of the population of Somerset.

RESULTS

The response rate was 76%. Only 28% of people with extremely high GHQ-12 scores (> or = 8) had sought help from their general practitioner but most (78%) had sought some form of help. Males, young people and people living in affluent areas were the least likely to seek help.

CONCLUSIONS

Health promotion interventions to encourage appropriate help-seeking behaviour in young people, particularly in men, may lead to improvements in the mental health of this group of the population.

GP treatment decisions for patients with depression: an observational study

BACKGROUND

GPs are prescribing more antidepressants than previously, but not in accordance with guidelines. The reasons why they prescribe are not well understood.

AIM

To explore associations between GP treatment and severity of depression, patients' life difficulties, previous history of illness and treatment, and patient attitudes.

DESIGN

Observational study in two phases, 3 years apart.

SETTING

Seven practices in Southampton, UK.

METHOD

Adult attenders who consented were screened for depression in the waiting room. After the consultation, the 17 participating GPs completed questionnaires on the perceived presence and severity of depression, patients' life difficulties, previous problems and treatment, patient attitudes towards antidepressants, and their treatment decisions. Patients returned postal questionnaires on sociodemographics, life events, physical health, and attitudes towards antidepressants.

RESULTS

Of 694 patients screened in the two phases, the GPs rated 101 (15%) as depressed, acknowledged depression in 44 cases (6%), and offered treatment in 27 (4%), including antidepressants in 14 (2%). Offers of antidepressants were more likely in both phases where the GPs rated the depression as moderate rather than mild, and where they perceived a positive patient attitude to antidepressants. However, GP ratings of severity did not agree well with the validated screening instrument, and their assessments of patients' attitudes to treatment were only moderately related to patients' self-reports.

CONCLUSIONS

In line with current guidelines, GPs base prescribing decisions on the perceived severity of depression, taking patients' preferences into account, but they do not accurately identify which patients are likely to benefit from treatment. Better ways to assess depression severity and patient attitudes towards antidepressants are needed in order to target treatment more appropriately.

Depressive symptoms in mothers of pre-school children--effects of deprivation, social support, stress and neighbourhood social capital

BACKGROUND

Depressive symptoms in mothers of young children can have serious consequences for the health of the child. In particular, children whose mothers are experiencing depressive symptoms are at significantly greater risk of poisoning and accidental injury. A mother's risk of developing depressive symptoms has been shown to be related to socio-economic disadvantage, high levels of stress and a perceived lack of social support. Residents who perceive their neighbourhoods to be of low social capital are more likely to report poor mental health. The aim of this study was to investigate the relationship between maternal depressive symptoms, deprivation, social support, stress and neighbourhood social capital in a group of mothers living in deprived areas of Nottingham, United Kingdom (UK).

DESIGN AND SETTING

A postal questionnaire at entry to a randomised controlled trial (RCT) assessed socio-demographic characteristics and a second questionnaire, 21 months later, assessed depressive symptoms, perceived lack of social support, self-reported stress and individual-level assessment of neighbourhood social capital.

PARTICIPANTS

A total of 846 mothers of young children living in deprived areas in Nottingham, UK, enrolled in the control group of an RCT.

RESULTS

One-third of mothers reported high levels of depressive symptoms. Neighbourhood-level deprivation and receiving means-tested benefits were independently associated with maternal depressive symptoms. A lack of social support and high levels of self-reported stress were also strongly associated with depressive symptoms. Individual-level assessment of neighbourhood social capital was not associated with depressive symptoms amongst mothers after adjusting for self-reported stress.

CONCLUSIONS

Neighbourhood- and individual-level variables of deprivation and psychological distress are more important than mother's assessment of the social capital of the neighbourhood in which she lives in determining the risk of depressive symptoms. Interventions aimed at supporting mothers of young children may be more effective at reducing the risks of depressive symptoms and consequent risks to the child's health than interventions aimed at improving a neighbourhood's social capital.

Housing improvement and self-reported mental distress among council estate residents

This paper is concerned with how housing improvements instigated either publicly or privately influence the degree of psychological stress reported by council estate residents in South Manchester. Stress is measured on the GHQ12 scale containing standard symptomatic items. Potential sources of variation in this indicator are analysed within a geographical setting where repeated samples of residents were drawn from two adjacent suburban council housing estates before and after the implementation of a single regeneration budget (SRB) housing initiative in late 1999. The residents of one of these estates (Wythenshawe) were targeted by this funding while those in the other (Mersey Bank) were not. The latter, therefore, serve as a control for the effects of the enhanced incidence of housing improvement activity promoted by this SRB. Regression analyses revealed that stress was raised significantly among the SRB residents perhaps on account of the additional environmental nuisance they encountered. The experience of stress among all residents, however, was dominated by measures of personal psychosocial risk and it is argued that future regeneration initiatives should address the manifestation of these risks in the effort to achieve better mental health.

Socio-economic differentials in mental disorders and suicide attempts in Australia

BACKGROUND

Responses to mental disorders usually focus on treatment; socio-economic conditions are less likely to be considered.

AIMS

To examine social determinants of mental disorders and attempted suicide in Australia.

METHOD

Data from the 1997 Australian National Survey of Mental Health and Wellbeing (n=10 641) were used to estimate associations between socio-economic status, mental disorders and attempted suicide. Logistic regression was used to adjust for age, urban/rural residence and country of birth. Socio-economic status differentials in suicide attempts were also adjusted for mental disorders.

RESULTS

Significant increasing gradients from high to low levels of education and occupational status (employed) were evident for affective disorders and anxiety disorders in both men and women and for substance use disorders in men. Similar gradients were found for suicide attempts, which decreased after adjusting for mental disorders, but remained significant in the working-age employed.

CONCLUSIONS

These findings suggest social causation of mental disorders and suicide attempts, and the need for social and economic responses beyond provision of mental health services.

Social position and minor psychiatric morbidity over time in the British Household Panel Survey 1991-1998

STUDY OBJECTIVE

To examine social inequalities in minor psychiatric morbidity as measured by the GHQ-12 using lagged models of psychiatric morbidity and changing job status.

DESIGN

GHQ scores were modelled using two level hierarchical regression models with measurement occasions nested within individuals. The paper compares and contrasts three different ways of describing social position: income, social advantage and lifestyle (the Cambridge scale), and social class (the new National Statistics Socio-Economic Classification), and adjusts for attrition.

SETTING

Survey interviews for a nationally representative sample of adults of working age living in Britain.

PARTICIPANTS

8091 original adult respondents in 1991 who remain of working age during 1991-1998 from the British Household Panel Survey (BHPS).

MAIN RESULTS

There was a relation of GHQ-12 to social position when social position was combined with employment status. This relation itself varied according to a person's psychological health in the previous year.

CONCLUSIONS

The relation between social position and minor psychiatric morbidity depended on whether or not a person was employed, unemployed, or economically inactive. It was stronger in those with previously less good psychological health. Among employed men and women in good health, GHQ-12 varied little according to social class, status, or income. There was a "classic" social gradient in psychiatric morbidity, with worse health in less advantaged groups, among the economically inactive. Among the unemployed, a "reverse" gradient was found: the impact of unemployment on minor psychiatric morbidity was higher for those who were previously in a more advantaged social class position.

Area and individual circumstances and mood disorder prevalence

BACKGROUND

Associations have been demonstrated between contextual (area level) factors and a range of physical health outcomes, but their relationship with mental health outcomes is less well understood.

AIMS

To investigate the relative strength of association between individual and area-level demographic and socio-economic factors and mood disorder prevalence in the UK.

METHOD

Cross-sectional data from 19 687 participants from the European Prospective Investigation into Cancer and Nutrition in Norfolk.

RESULTS

Area deprivation was associated with current (12-month) mood disorders after adjusting for individual-level socio-economic status (OR for top v. bottom quartile of deprivation scores 1.29, 95% CI 1.1-1.5, P<0.001). However, this association was small relative to those observed for individual marital and employment status. Significant residual area-level variation in current mood disorders (representing 3.6% of total variation, P=0.04) was largely accounted for by individual-level factors.

CONCLUSIONS

The magnitude of the association between socio-economic status and mood disorders is greater at the individual level than at the area level.

Housing and health in Germany

STUDY OBJECTIVES

To examine the association between housing tenure and self rated health, controlling for socioeconomic measures and testing the mediating effects of physical features of the home, pollution in the local environment, and relationships with neighbours.

DESIGN

Cross sectional panel study with people nested within households. Analyses were performed using multilevel methods.

SETTING

Population based sample in Germany.

PARTICIPANTS

People aged 16 or older were interviewed in the 1999 wave of the socio-economic panel study (n = 14 055) and nested within households (n = 7381).

MAIN RESULTS

44.0% of the population lived in homes that they owned. In bivariate analyses, women, people who live in apartment buildings, reside near cities, live in crowded homes, have homes in need of renovation, report higher pollution, and have distant contact with neighbours are more likely to live in rented homes. In multilevel analyses, renting a home was found to be associated with poor self rated health (OR 1.48, 95% CI 1.31 to 1.68). This relation persisted after controlling for education and income and was partially mediated by the need for household renovation, the perception of air and noise pollution in the local area, and distant relationship with neighbours, all of which were significantly associated with self rated health.

CONCLUSIONS

This study provides evidence that home ownership is significantly associated with self rated health in Germany, and this relation may be, in part, mediated by physical and social features of home and neighbourhood.

Contextual risk factors for the common mental disorders in Britain: a multilevel investigation of the effects of place

STUDY OBJECTIVE

To test hypotheses about associations between area level exposures and the prevalence of the most common mental disorders (CMD) in Britain. A statistically significant urban-rural gradient was predicted, but not a socioeconomic gradient, in the prevalence of CMD after adjusting for characteristics of individual respondents. The study tested the hypothesis that the effects of area level exposures would be greatest among those not in paid employment.

DESIGN

Cross sectional survey, analysed using multilevel logistic and linear regression. CMD were assessed using the General Health Questionnaire (GHQ). Electoral wards were characterised using the Carstairs index, the Office of National Statistics (ONS) Classification of Wards, and population density.

SETTING

England, Wales, and Scotland.

PARTICIPANTS

Nearly 9000 adults aged 16-74 living in 4904 private households, nested in 642 electoral wards.

MAIN RESULTS

Little evidence was found of statistically significant variance in the prevalence of CMD between wards, which ranged from 18.8% to 29.5% (variance 0.035, SE 0.026) (p=0.11). Associations between CMD and characteristics of wards, such as the Carstairs index, only reached statistical significance among those who were economically inactive (adjusted odds ratio for top v bottom Carstairs score quintile 1.58, 95% CI 1.08 to 2.31) (p<0.05).

CONCLUSIONS

There may be multiple pathways linking socioeconomic inequalities and ill health. The effects of place of residence on mental health are greatest among those who are economically inactive and hence more likely to spend the time at home.

Risk factors for childhood major and minor head and other injuries in a nationally representative sample

OBJECTIVE

To assess the relationship between demographic, socioeconomic, family type and behavioural factors and childhood major and minor head and other injuries.

DESIGN, SUBJECTS AND SETTING

A cross-sectional study, on a large nationally representative sample of 5913 children aged 4-15 years (Health Survey for England, 1997).

MAIN OUTCOME MEASURES

Frequency of major and minor head and other injuries.

RESULTS

There were no significant associations between any of the socioeconomic factors and family type and major and minor injuries, except for major head injuries in children who lived in families receiving more than one social or financial benefit. Boys were 1.5 times more likely to suffer major head and other injuries than girls. Older children were significantly more likely to experience major and minor other injuries, but less likely to have major and minor head injuries, compared to younger children. High scores for conduct disorder and emotional symptoms were significant risk factors for other major injuries, while high scores for hyperactivity and conduct disorder were significantly related to major and minor head injuries. The risk factors assessed were often stronger for major than for minor injuries, and stronger for head than other injuries.

CONCLUSION

Boys and children who exhibit certain behavioural problems such as high levels of hyperactivity were significantly more likely to report major and minor injuries affecting the head region.

Socio-economic differences in psychiatric in-patient care

OBJECTIVE

We seek to investigate socio-economic differences in psychiatric in-patient care regarding admission, treatment and outcome.

METHOD

This study is undertaken on a comprehensive and exhaustive psychiatric case register of all psychiatric in-patient care carried out in Belgium in 1997 and 1998 (n=144 754).

RESULTS

Lower socio-economic groups were more likely to be compulsorily admitted, to be cared for in a non-teaching or psychiatric hospital, to be admitted in a hospital with unexpectedly long average length of stay and to be admitted to a ward with a more severe case-mix. They were less likely to receive antidepressants and psychotherapies. The improvements in functioning and in symptoms were also less favourable for these groups. The lowest group had a higher risk of dying in the hospital.

CONCLUSION

Psychiatric in-patient care is associated with moderate socio-economic differences in access, treatment and outcome. Further research is needed to clarify the causes of such disparities.

Childhood and adulthood risk factors for socio-economic differentials in psychological distress: evidence from the 1958 British birth cohort

Social inequalities in psychological status have been attributed to health selection and to social causation. We used data from the 1958 British birth cohort, followed over three decades, to identify causes of inequality in adulthood. Psychological status prior to labour market entry influenced inter-generational mobility, but selection effects were weaker for intra-generational mobility, between age 23 and 33. However, selection failed to account for social differences in risk of distress of approximately threefold in classes IV&V compared with I&II. Both childhood and adult life factors appeared to contribute to the development of inequalities. The principal childhood factors were ability at age 7 for both sexes and adverse environment (institutional care for men and low class for women). Adult life factors varied, with stronger effects for work factors (job strain and insecurity) for men and qualifications on leaving school, early child-bearing and financial hardship for women. Gradients in psychological distress reflect the cumulative effect of multiple adversities experienced from childhood.

Prevalência de distúrbios psiquiátricos menores na cidade de Pelotas, RS

Foi realizado um estudo transversal, de base populacional, com o objetivo de determinar a prevalência de distúrbios psiquiátricos menores (DPM) e verificar sua associação com fatores de risco. A amostragem por conglomerados foi definida em estágios múltiplos, incluindo 1967 pessoas com idade entre 20 e 69 anos, identificadas em 40 setores censitários da zona urbana da cidade de Pelotas. As entrevistas foram realizadas nos domicílios, utilizando-se um questionário pré-codificado, contendo SRQ-20, informações socioeconômicas e demográficas, presença de doenças crônicas, utilização de serviços de saúde, consumo de álcool, hábito de tabagismo e coleta de medidas antropométricas. A presença de DPM foi definida a partir de 6 e 7 respostas positivas no SRQ-20, para homens e mulheres, respectivamente. A prevalência de DPM foi de 28,5%, com intervalo de confiança de 95% entre 26,5% e 30,5%. A prevalência foi maior nas pessoas inseridas nas classes sociais mais baixas, de menor renda, acima de 40 anos e do sexo feminino. Na análise ajustada, os distúrbios psiquiátricos menores mantiveram-se associados com hábito de tabagismo, presença de doença crônica não transmissível e freqüência de consultas médicas. Os resultados indicam que as prevalências de DPM foram semelhantes a outros estudos realizados no município e atingem principalmente as camadas sociais mais baixas. Embora não tenham sido diferentes em relação ao tipo de serviço de saúde utilizado, mostraram associação com a freqüência de utilização de assistência médica, sugerindo que esses resultados possam orientar a formação de profissionais de saúde e o planejamento das ações de saúde.

Income inequality and self rated health in Britain

STUDY OBJECTIVE

Several studies have reported an association between income inequality and increased mortality, but few have used net income data, controlled for individual income, or evaluated sensitivity to the choice of inequality measure. The study tested the hypotheses that people in regions of Britain with the greatest income inequality would report worse health than those in other regions, after adjusting for individual socioeconomic circumstances.

DESIGN

Cross sectional survey.

SETTING

England, Wales, and Scotland.

PARTICIPANTS

8366 people living in private households.

MAIN RESULTS

Regional income inequality, measured using the Gini index, was associated with worse self rated health, especially among those with the lowest incomes (adjusted OR 1.55, 95% CI 1.24 to 1.92) (p<0.001). This association was not robust to the choice of income inequality measure, being maximal for the Gini coefficient and weakest when using indices that are more sensitive to income differences among those at the top or bottom of the income distribution.

CONCLUSIONS

The study found limited evidence of an association between income inequality and worse self rated health in Britain, which was greatest among those with the lowest individual income levels. As regions with the highest income inequality were also the most urban, these findings may be attributable to characteristics of cities rather than income inequality. The variation in this association with the choice of income inequality measure also highlights the difficulty of studying income distributions using summary measures of income inequality.

Measuring the built environment: validity of a site survey instrument for use in urban settings

There are few reliable measures of place with which to study the effects of socio-economic context on health. We report on the development and inter-rater reliability of a 27-item observer-rated built environment site survey checklist (BESSC). Across eleven 'housing areas' (defined as areas of homogeneity in housing form) and two raters, kappa coefficients were > or =0.5 for fifteen categorical items, and intra-class correlation coefficients exceeded 0.6 for a further three continuous measures. Ratings on several BESSC items were associated to a statistically significant degree with the prevalence of depression and residents' dissatisfaction with 'their area as a place to live'. BESSC items may prove to be valuable descriptors of the urban built environment in future studies.

Attributable fractions: fundamental concepts and their visualization

A general methodology for visualizing attributable fractions in epidemiology is described. The methodology applies to the multifactorial exposure situation and embraces various types of attributable fractions including adjusted, sequential and average attributable fractions. The concept of the scaled Venn diagram plays a central role, illustrating total disease risk and excess disease risk attributable to the exposures as areas in a unit square. This forms the ground for making simple pie charts of attributable fractions summing to 1 (or 100%). The potential applications extend from cohort and cross-sectional data to data from case-control studies. The methodology is illustrated by theoretical as well as empirical examples including the risk of motor fatalities attributable to driver's blood alcohol concentration and age, and the prevalence of chronic cough attributable to smoking habits, occupational exposure to dust or gas, and residence. A total of 40 figures illustrate the methodology.

Income and health: the time dimension

It is widely recognised that poverty is associated with poor health even in advanced industrial societies. But most existing studies of the relationship between the availability of financial resources and health status fail to distinguish between the transient and permanent impact of poverty on health. Many studies also fail to address the possibility of reverse causation; poor health causes low income. This paper aims to address these issues by moving beyond the static perspective provided by cross-sectional analyses and focusing on the dynamic nature of people's experiences of income and health. The specific objective is to investigate the relationship between income and health for adult participants in the British Household Panel Survey from 1991 to 1996/97. The paper pays particular attention to: the problem of health selection; the role of long-term income; and, the effect of income dynamics on health. The results confirm the general findings from the small number of longitudinal studies available in the international literature: long-term income is more important for health than current income; income levels are more significant than income change; persistent poverty is more harmful for health than occasional episodes; and, income reductions appear to have a greater effect on health than income increases. After controlling for initial health status the association between income and health is attenuated but not eliminated. This suggests that there is a causal relationship between low income and poor health.

Income inequality and the prevalence of common mental disorders in Britain

BACKGROUND

It has been hypothesised that the association between greater income inequality and increased mortality is mediated by poor psychosocial health.

AIMS

To test the hypothesis that individuals in regions of Britain with the highest income inequality have a higher prevalence of the common mental disorders, after adjusting for individual income.

METHOD

Cross-sectional survey of 8191 adults aged 16-75 in private households in England, Wales and Scotland. The prevalence of common mental disorders was assessed using the General Health Questionnaire.

RESULTS

The association between income inequality and prevalence of the common mental disorders varied with individual income level. Among persons with the highest incomes, common mental disorders were more frequent in regions with greater income inequality (as indicated by high Gini coefficient) (adjusted OR 1.31,95% C1 1.05-1.65; P: = 0.02). The opposite was true for those with the lowest incomes.

CONCLUSIONS

Income inequality was associated with worse mental health among the most affluent individuals.

Agreement in symptoms of anxiety and depression between patients and GPs: the influence of ethnicity

BACKGROUND

Few studies have focused specifically on the role of ethnicity in the identification and treatment of anxiety and depressive symptoms among patients consulting GPs.

METHODS

A survey was conducted of 4753 patients aged 18-90 years attending general practices in Sydney, Australia. Three methods of case detection were used: a GHQ-12 score (> or = 3), self-report symptoms (using a checklist) and GP detection of symptoms. Four regional groupings based on country of birth [other English speaking countries (ESB), European, Asian (predominantly south east Asian) and other non-English speaking (other NESB)] were compared with Australian (AB) patients.

RESULTS

Compared with AB patients, Asian patients had a lower mean GHQ-12 score (2.04 versus 2.54) and a lower rate of GP detection (10.4% versus 20.5%) but they recorded a similar rate of self-report symptoms (16.7% versus 20.1%). For Asian patients, 24.6% of all cases identified by self-report or by GP detection were identified by both methods, compared with 44% for AB patients. Similar patterns of treatment and referral were observed for detected cases. Compared with AB patients, Asian and other NESB patients were more likely to desire more time to discuss their problems with their GP (18.5% versus 42.0%, 37.3%) and receive an explanation of medications prescribed (18.9% versus 46%, 40.0%).

CONCLUSION

These results suggest that there are substantial variations in the rates of detection of anxiety and depressive symptoms in GP patients depending on the screening methods used and the broad ethnic background of patients. Such symptoms may be under-diagnosed in Asian patients in particular.

The Australian National Survey of Mental Health and Well-Being. Common psychological symptoms and disablement

BACKGROUND

The mental health of populations can be represented by case prevalence rates and by symptom scales. Scales have the advantage of identifying sub-syndromal levels of distress, which may be common and associated with considerable disability.

AIMS

To examine the distribution of common psychological symptoms and associated disablement in the Australian population.

METHOD

A household sample of 10,641 individuals representative of the adult population of Australia was interviewed using the Composite International Diagnostic Interview and completed scales measuring recent symptoms and disablement.

RESULTS

Symptom scales showed similar associations with socio-economic variables as did diagnoses, although only a small amount of variance in symptom levels was explained by these variables. Considerable disablement was associated with symptom levels indicating distress but not reaching levels for formal diagnoses of anxiety or depression.

CONCLUSIONS

Symptom scales provide parsimonious measures of psychological distress and are appropriate for use in large-scale surveys of mental health and disablement.