Dimensionality of the Whiteley Index: assessment of hypochondriasis in an Australian sample of primary care patients

Confirmatory factor analysis and item response theory analysis of the Whiteley Index. Results from a large population based study in Norway. The Hordaland Health Study (HUSK)

OBJECTIVE

The Whiteley Index (WI) is a widely used screening instrument for health anxiety/hypochondriasis. Several studies have previously explored the psychometric properties of the WI, but with mixed findings concerning both item composition and factor structure. The main aim of the current study was to examine different factor structures as identified from previous studies using data from a large general population based study. We also wanted to provide gender specific norms.

METHODS

Data were taken from a large population-based study in Norway, the Hordaland Health Study (HUSK N=7274). Confirmatory factor analysis (CFA) of several models of the WI was conducted. Item response theory (IRT) analysis was performed on the model with the best goodness-of-fit.

RESULTS

CFA of all previously proposed factor models of the WI revealed clearly inadequate model fits. The IRT analysis suggested that a six-item model best described the data, and CFA confirmed an adequate goodness-of-fit across indices.

CONCLUSION

The current study found evidence for a six-item, single-factor model of the WI. Our findings suggest that this abbreviated version has the best factor structure compared to previously proposed factor models. We recommend that the factor structure identified in this study should be investigated further in independent samples.

The Concerns About Recurrence Questionnaire: validation of a brief measure of fear of cancer recurrence amongst Danish and Australian breast cancer survivors

PURPOSE

Fear of cancer recurrence (FCR) is prevalent amongst survivors, and breast cancer survivors are particularly vulnerable. Currently, there are few well-validated brief measures of FCR and none specific to breast cancer. This manuscript describes the development and initial validation of a new measure of FCR for breast cancer survivors, the Concerns about Recurrence Questionnaire (CARQ), and reports its initial validation in an Australian and Danish population-based sample of breast cancer survivors.

METHODS

CTT analyses explored scale reliability and validity; Rasch analyses explored model fit statistics, item bias (DIF) and local dependency. Three-item, four-item and five-item versions were considered.

RESULTS

Two hundred eighteen Australian women aged 28-45 years diagnosed with early-stage breast cancer (stages 0-2) and 2001 Danish women diagnosed with breast cancer (stages 1-3) aged 26-70 completed the CARQ. Based on the results of both CTT and IRT analyses, the four-item English version of the scale performed best. Although the CTT analyses suggested that the CARQ-4 was reliable and valid in both samples, Rasch analyses identified item bias relative to age, and local dependence which may be remedied by further scale development.

CONCLUSIONS

The CARQ-4 English version is currently one of the most rigorously tested brief scales of FCR available.

IMPLICATIONS FOR CANCER SURVIVORS

The availability of more valid and reliable brief measures of FCR will help to promote research and screening of FCR amongst cancer survivors.

The Multidimensional Inventory of Hypochondriacal Traits

Severe health anxiety constitutes a disabling and costly clinical condition. The Multidimensional Inventory of Hypochondriacal Traits (MIHT) represents an innovative instrument that was developed according to cognitive-behavioral, cognitive-perceptual, interpersonal, and trait models of hypochondriasis. We aimed at evaluating the psychometric properties of the MIHT in a sample of patients with the Diagnostic and Statistical Manual of Mental Disorders (4th ed.) diagnosis of hypochondriasis. Using confirmatory factor analysis (CFA), the postulated four-factor structure of the MIHT was found in a first CFA in patients with hypochondriasis ( n = 178) and in a second CFA based on a mixed sample, with other somatoform disorders ( n = 27), panic disorder ( n = 25), and healthy controls ( n = 31) added to the original group of patients with hypochondriasis ( n = 178). In terms of specificity, patients with hypochondriasis showed larger scores on all four MIHT subscales (i.e., affective, cognitive, behavioral, and perceptual) compared to all other groups. Analyses of convergent and discriminant validity revealed promising results concerning the MIHT affective and perceptual scales but also point to certain problematic issues concerning the MIHT cognitive and behavioral scales. The findings suggest that the proposed structure of the MIHT is valid also in patients with hypochondriasis and demonstrate the specificity of the four hypochondriacal traits assessed in the MIHT.

A community-based epidemiological study of health anxiety and generalized anxiety disorder

This community-based study examined the frequency of worry about personal health in respondents with and without generalized anxiety disorder (GAD), and the impact of health anxiety on the disorder. A random community-based telephone survey of 5118 Chinese respondents aged 18-64 was conducted. A fully structured questionnaire covered the DSM-IV-TR criteria of GAD, major depressive episode (MDE), eight domains of worry, the seven-item Whiteley Index (WI-7), health service use, and socio-demographic information. Worry about personal health ranked fifth (75.6%) among eight domains of worries examined. GAD respondents with high level of health anxiety were significantly older, less educated, and had lower family income. High health anxiety significantly increased the occurrence of one-year MDE, previous persistent worry, previous persistent low mood, number of domains of worries, number of non-core DSM-IV-TR GAD symptoms, health service use, and mistrust of doctors. Health anxiety is common in GAD and may signify greater severity of the disorder.

Assessing Bodily Preoccupations is sufficient: clinically effective screening for hypochondriasis

OBJECTIVE

Hypochondriasis is a persistent psychiatric disorder and is associated with increased utilisation of health care services. However, effective psychiatric consultation interventions and CBT treatments are available. In the present study, we provide evidence of clinically effective screening for hypochondriasis. We describe the clinically effective identification of patients with a high probability of suffering from hypochondriasis. This identification is achieved by means of two brief standardised screening instruments, namely the Bodily Preoccupation (BP) Scale with 3 items and the Whiteley-7 (WI-7) with 7 items.

METHODS

Both the BP scale and the WI-7 were examined in a sample of 228 participants (72 with hypochondriasis, 80 with anxiety disorders and 76 healthy controls) in a large psychotherapy outpatients' unit, applying the DSM-IV criteria. Cut-off values for the BP scale and the WI-7 were computed to identify patients with a high probability of suffering from hypochondriasis. Additionally, other self-report symptom severity scales were completed in order to examine discriminant and convergent validity. Data was collected from June 2010 to March 2013.

RESULTS

The BP scale and the WI-7 discriminated significantly between patients with hypochondriasis and those with an anxiety disorder (d=2.42 and d=2.34). Cut-off values for these two screening scales could be provided, thus identifying patients with a high probability of suffering from hypochondriasis.

CONCLUSIONS

In order to reduce costs, the BP scale or the WI-7 should be applied in medical or primary care settings, to screen for patients with a high probability of hypochondriasis and to transfer them to further assessment and effective treatment.

Association of costs with somatic symptom severity in patients with medically unexplained symptoms

OBJECTIVE

To analyse the association of direct and indirect costs in patients with medically unexplained symptoms (MUS) with somatic symptom severity (SSS).

METHODS

A cross-sectional cost analysis for retrospective 6 months was conducted in 294 primary care patients with MUS. Health care utilisation and loss of productivity were measured by questionnaires. SSS was measured using the "Patient Health Questionnaire 15" (PHQ-15). Direct and indirect costs and the association of costs with SSS were analysed via multiple linear regression analysis.

RESULTS

Patients with MUS had average 6-month direct costs of 1098 EUR and indirect costs of 7645 EUR. For direct costs, outpatient physician visits were the most expensive single cost category (36%), followed by pharmaceuticals (25%) and hospital stays (19%). Indirect costs were predominantly caused by productivity reduction at work (56%) followed by early retirement (29%) and acute sickness absence (14%). As compared to mild SSS, moderate SSS was not significantly associated with direct, but with indirect costs (+2948 EUR; p<.001); severe SSS was associated with increased direct cost (+658 EUR; p=.001) and increased indirect costs (+4630 EUR; p<.001). Age was positively associated with direct cost (+15 EUR for each additional year; p=.015) as well as indirect cost (+104 EUR for each additional year; p<.001).

CONCLUSIONS

MUS are associated with relevant direct and even much higher indirect costs that strongly depend on SSS.

Psychological morbidity and stress but not social factors influence level of fear of cancer recurrence in young women with early breast cancer: results of a cross-sectional study

BACKGROUND

Fear of cancer recurrence (FCR) is a common problem amongst survivors. Past research has shown that young women with breast cancer are particularly vulnerable to FCR, yet few previous studies have specifically examined FCR in this subgroup.

AIMS

The aim of the study is to explore the relationship between FCR, psychological morbidity and social factors. A secondary aim was to explore the relationship between clinical levels of FCR and generalised anxiety disorder (GAD) and hypochondriasis.

METHOD

Two hundred eighteen breast cancer survivors (aged 18-45 years at diagnosis) diagnosed at least 1 year prior were recruited through seven metropolitan oncology clinics and two breast cancer consumer groups. Participants completed a web-based questionnaire, which assessed FCR, psychological functioning, generalised anxiety, hypochondriasis and items exploring past cancer-related experiences, attitudes to future childbearing, social support and correlates were identified using linear regression.

RESULTS

Psychological morbidity scales measuring anxiety and psychological functioning and stressful life events were significantly associated with FCR in adjusted and unadjusted models (p < 0.0001). Past cancer experiences, children, social support and attitudes to childrearing were not associated with FCR. Among those with clinical levels of FCR (n = 152), 43% met screening criteria for hypochondriasis, and 36% met screening criteria for GAD.

CONCLUSIONS

This study shows psychological morbidity is associated with FCR, but the majority of women with high levels of FCR do not also meet the criteria for a clinical level of GAD or hypochondriasis. Understanding the factors that make young women vulnerable to FCR is important to help guide the development of FCR-specific interventions for this subgroup.

Poor self-rated health and its associations with somatisation in two Australian national surveys

OBJECTIVES

It is hypothesised that across two national surveys poor self-rated health will be independently associated with somatisation and will result in high rates of service use after adjusting for established diagnoses.

DESIGN

Two cross-sectional population-based surveys were conducted in 1997 and 2007. The use of both surveys allowed replication of results.

SETTING

Australia.

PARTICIPANTS

The 1997 and 2007 National Surveys of Mental Health and Well-Being were based on stratified, multistage area probability samples of persons living in private dwellings in Australia. The 1997 survey included 10 641 respondents aged 18-75 years, a response rate of 78%. The 2007 survey included 8841 respondents aged 16-85 years, a response rate of 60%.

MAIN OUTCOME MEASURES

Self-rated health.

RESULTS

Approximately 15% of the Australian population rated their health as fair or poor in both surveys. The independent relationship between self-rated health and somatisation was replicated across both surveys in multivariate analyses. Individuals with negative self-rated health were 4.1 times as likely to screen positive for health anxiety (OR 4.1, 95% CI 2.8 to 5.9) and 3.4 times as likely to be diagnosed with neurasthenia (OR 3.4, 95% CI 2.2 to 5.2), when compared with individuals who rated their health positively. Individuals with negative self-rated health were also more likely to use health services after controlling for demographics and mental and physical illness.

CONCLUSIONS

These results confirm both of the study hypotheses: (1) that negative self-rated health was powerfully and independently associated with somatisation and (2) that this relationship manifested itself in high rates of service use, even after adjusting for an extensive range of demographics and psychiatric and physical conditions.

Specific collaborative group intervention for patients with medically unexplained symptoms in general practice: a cluster randomized controlled trial

BACKGROUND

Patients with medically unexplained symptoms (MUS) are frequent in primary care and substantially impaired in their quality of life (QoL). Specific training of general practitioners (GPs) alone did not demonstrate sustained improvement at later follow-up in current reviews. We evaluated a collaborative group intervention.

METHODS

We conducted a cluster randomized controlled trial. Thirty-five GPs recruited 304 MUS patients (intervention group: 170; control group: 134). All GPs were trained in diagnosis and management of MUS (control condition). Eighteen randomly selected intervention GPs participated in training for a specific collaborative group intervention. They conducted 10 weekly group sessions and 2 booster meetings in their practices, together with a psychosomatic specialist. Six and 12 months after baseline, QoL was assessed with the Short-Form 36. The primary outcome was the physical composite score (PCS), and the secondary outcome was the mental composite score (MCS).

RESULTS

At 12 months, intention-to-treat analyses showed a significant between-group effect for the MCS (p = 0.023) but not for the PCS (p = 0.674). This effect was preceded by a significant reduction of somatic symptom severity (15-item somatic symptom severity scale of the Patient Health Questionnaire, PHQ-15) at 6 months (p = 0.008) that lacked significance at 12 months (p = 0.078). As additional between-group effects at 12 months, per-protocol analyses showed less health anxiety (Whiteley-7; p = 0.038) and less psychosocial distress (PHQ; p = 0.024); GP visits were significantly (p = 0.042) reduced in the intervention group.

CONCLUSIONS

Compared to pure GP training, collaborative group intervention achieved a progressive, clinically meaningful improvement in mental but not physical QoL. It could bridge gaps between general practice and mental health care.

Acceptance and commitment group therapy for health anxiety--results from a pilot study

Health anxiety (or hypochondriasis) is prevalent, may be persistent and disabling for the sufferers and associated with high societal costs. Acceptance and Commitment Therapy (ACT) is a new third-wave behavioral cognitive therapy that has not yet been tested in health anxiety. 34 consecutive Danish patients with severe health anxiety were referred from general practitioners or hospital departments and received a ten-session ACT group therapy. Patients were followed up by questionnaires for 6 months. There were significant reductions in health anxiety, somatic symptoms and emotional distress at 6 months compared to baseline: a 49% reduction in health anxiety (Whiteley-7 Index), a 47% decrease in emotional distress (SCL-8), and a 40% decrease in somatic symptoms (SCL-90R Somatization Subscale). The patients' emotional representations and perception of the consequences of their illness (IPQ) improved significantly, and 87% of the patients were very or extremely satisfied with the treatment.

Validity and responsiveness of the EQ-5D in assessing and valuing health status in patients with somatoform disorders

BACKGROUND

The EQ-5D is a generic questionnaire providing a preference-based index score applicable to cost-utility analysis. This is the first study to validate the EQ-5D in patients with somatoform disorders.

METHODS

Data of the EQ-5D descriptive system, the British and the German EQ-5D index and the EQ Visual Analogue Scale, the Patient Health Questionnaire 15, the Patient Health Questionnaire 9, the Whiteley Index 7 and the Short Form 36 were collected from 294 patients at baseline, 244 at 6 months and 256 at 12 months after baseline. The discriminative ability of the EQ-5D was evaluated by comparison with a general population sample and by the ability to distinguish between different symptom severities. Convergent validity was analysed by assessing associations between the EQ-5D and the other instruments. Responsiveness was evaluated by analysing the effects on scores between two measurements in groups of patients reporting worse, same or better health. The Bonferroni correction was employed.

RESULTS

For all items of the EQ-5D except 'self-care', patients with somatoform disorders reported more problems than the general population. The EQ-5D showed discriminative ability in patients with different symptom severities. For nearly all reference instruments there were significant differences in mean scores between respondents with and without problems in the various EQ-5D items and strong correlations with the EQ Visual Analogue Scale and the EQ-5D index scores. Evidence for the responsiveness of the EQ-5D could only be found for patients with better health; effects were medium at the utmost.

CONCLUSIONS

The EQ-5D showed a considerable validity and a limited responsiveness in patients with somatoform disorders.

TRIAL REGISTRATION

Current Controlled Trials ISRCTN55280791.

Health anxiety in Australia: prevalence, comorbidity, disability and service use

BACKGROUND

Health anxiety is associated with high distress, disability and increased health service utilisation. However, there are relatively few epidemiological studies examining the extent of health anxiety or the associated sociodemographic and health risk factors in the general population.

AIMS

To provide epidemiological data on health anxiety in the Australian population.

METHOD

Lifetime and current prevalence estimates, associations between comorbid disorders, psychological distress, impairment, disability and mental health service utilisation were generated using the Australian 2007 National Survey of Mental Health and Wellbeing.

RESULTS

Health anxiety affects approximately 5.7% of the Australian population across the lifespan and 3.4% met criteria for health anxiety at the time of the interview. Age, employment status, smoking status and comorbid physical conditions were significantly related to health anxiety symptoms. Health anxiety was associated with significantly more distress, impairment, disability and health service utilisation than that found in respondents without health anxiety.

CONCLUSIONS

Health anxiety is non-trivial; it affects a significant proportion of the population and further research and clinical investigation of health anxiety is required.

Psychological factors predict local and referred experimental muscle pain: a cluster analysis in healthy adults

BACKGROUND

Recent studies suggest an underlying three- or four-factor structure explains the conceptual overlap and distinctiveness of several negative emotionality and pain-related constructs. However, the validity of these latent factors for predicting pain has not been examined.

METHODS

A cohort of 189 (99 female, 90 male) healthy volunteers completed eight self-report negative emotionality and pain-related measures (Eysenck Personality Questionnaire - Revised, Positive and Negative Affect Schedule, State-Trait Anxiety Inventory, Pain Catastrophizing Scale, Fear of Pain Questionnaire; Somatosensory Amplification Scale, Anxiety Sensitivity Index and Whiteley Index). Using principal axis factoring, three primary latent factors were extracted: general distress, catastrophic thinking and pain-related fear. Using these factors, individuals clustered into three subgroups of high, moderate and low negative emotionality responses. Experimental pain was induced via intramuscular acidic infusion into the anterior tibialis muscle, producing local (infusion site) and/or referred (anterior ankle) pain and hyperalgesia.

RESULTS

Pain outcomes differed between clusters (multivariate analysis of variance and multinomial regression), with individuals in the highest negative emotionality cluster reporting the greatest local pain (p = 0.05), mechanical hyperalgesia (pressure pain thresholds; p = 0.009) and greater odds (2.21 odds ratio) of experiencing referred pain when compared to the lowest negative emotionality cluster.

CONCLUSION

Our results provide support for three latent psychological factors explaining the majority of the variance between several pain-related psychological measures, and that individuals in the high negative emotionality subgroup are at increased risk for (1) acute local muscle pain; (2) local hyperalgesia; and (3) referred pain using a standardized nociceptive input.

A general population study of the Chinese Whiteley-7 index in Hong Kong

OBJECTIVE

To examine the psychometric properties of the Chinese seven-item Whiteley Index (WI-7) in the general population of Hong Kong.

METHODS

A random community-based telephone survey of 3014 respondents aged 15-65 was conducted using a fully structured questionnaire that included the WI-7, 15-item Patient Health Questionnaire (PHQ-15), Sheehan Disability Scale (SDS), and items about the frequency of health service use, perceived helpfulness of doctors, level of satisfaction with doctors, and sociodemographic variables. A sub-sample of 199 respondents was re-interviewed to assess test-retest reliability.

RESULTS

The WI-7 exhibited satisfactory internal consistency (Cronbach's α=0.73) and stable one-month test-retest reliability. The most commonly endorsed item was "worrying a lot about one's health" (55.7%), followed by "worrying about getting the disease oneself if it is brought to his/her attention" (48.7%) and "bothered by many different pains and aches" (33.9%). Age, gender, and monthly family income significantly predicted WI-7 score. Confirmatory factor analysis revealed that a 2-factor structure was superior to a 1-factor structure in fitting the data. WI-7 total score was positively associated with PHQ-15 somatic distress, SDS impairment, number of healthcare visits, lower levels of perceived helpfulness of doctors and of satisfaction with doctors.

CONCLUSION

The Chinese WI-7 exhibits satisfactory reliability and internal validity in a general population. It is a promising tool for the empirical examination of health anxiety which is a common experience with a mostly typical epidemiological profile among Chinese people in Hong Kong.

Tactile perceptual processes and their relationship to medically unexplained symptoms and health anxiety

OBJECTIVE

The Somatic Signal Detection Task (SSDT; Lloyd, Manson, Brown and Poliakoff, 2008) is an innovative paradigm to study perceptual processes related to physical symptoms. It allows examining touch illusions as a laboratory analog of medically unexplained symptoms (MUS) according to the cognitive model of MUS proposed by Brown (2004). The present study compared psychopathologic measures of MUS and health anxiety with SSDT parameters. Furthermore, we aimed to define a reliable measurement of tactile perception threshold.

METHODS

67 participants of a student population reported whether they detected tactile stimuli at their fingertip which were presented in half of the test trials. An additional brief visual stimulus was displayed with a probability of 50%. The rate of false-positive perceptions of the tactile stimulus in its absence, response bias, tactile sensitivity, and tactile perception thresholds was recorded. Questionnaires were used to assess MUS and health anxiety.

RESULTS

The visual stimulus led to a more liberal response criterion (i.e., the tendency to report tactile perceptions irrespective of whether a stimulus was presented or not) and a non-significant increase in tactile sensitivity. The false-alarm rate when reporting the tactile stimulus was correlated with MUS (r=.26). Tactile perception thresholds were measured reliably (r(tt)=.84).

CONCLUSION

Some of the SSDT parameters, especially the response criterion (c), were related to self-report-measures of MUS and health anxiety. Previous SSDT results were replicated and extended. Further SSDT studies with clinical samples are needed.

Evaluating new proposals for the psychiatric classification of patients with multiple somatic symptoms

OBJECTIVES

The current DSM-IV classification of somatoform disorders has been criticized, and several new proposals for classification have been suggested (e.g., DSM-V work group: complex somatic symptom disorder [CSSD]). Our aim was to empirically validate and compare new proposals for the classification of people with multiple somatic complaints.

METHODS

Three hundred twenty-one participants were selected from a general population sample of more than 2500; half were selected from a subgroup with increased somatization scores (Patient Health Questionnaire 15-item somatic symptom subscale). Clinical and psychological variables and health care use were assessed with interviews and self-ratings to validate the new proposals. In addition, a high-risk group was defined to check whether new classification proposals could identify people in this a priori defined group; criteria for this high-risk group were disabling medically unexplained somatic symptoms and increased health care use. To analyze the stability of the syndromes, participants were recontacted 1 year later (completion rate, 76%).

RESULTS

The DSM-V proposal for CSSD shows good validity in the identification of people with disability and people requiring medical treatment. It is still restrictive but to a much lesser degree than the current somatization disorder: 29% of our a priori high-risk group was identified, whereas none of the participants fulfilled criteria for somatization disorder. For most proposals, the temporal stability is satisfactory yet substantially lower than expected for clinical samples. Classification criteria that include psychological features are advantageous in identifying people with health care needs.

CONCLUSIONS

Whereas some validation criteria for the new proposals (including CSSD) are satisfactory, most of the new proposals are still restrictive.

Measuring health anxiety: moving past the dichotomous response option of the original Whiteley Index

The Whiteley Index [WI; Pilowsky, I. (1967). Dimensions of hypochondriasis. British Journal of Psychiatry, 113, 89-93] is a widely used self-report measure of health anxiety, hypochondriasis, and illness phobia; however, the factor structure of the WI has proven unstable. Moreover, factorial investigations of the WI persist in the original true/false response format despite criticisms of dichotomous scales and the availability of a Likert scale version [Barsky, A. J., Cleary, P. D., Wyshak, G., Spitzer, R. L., Williams, J. B. W., & Klerman, G. L. (1992). A structured diagnostic interview for hypochondriasis: a proposed criterion standard. The Journal of Nervous and Mental Disease, 180, 20-27]. The current investigation explores the factor structure of the 5-point Likert scale version of the WI using a sample of 287 students (64 men, ages 18-34 [M=20.6; SD=3.2]; 223 women ages 18-45 [M=20.2; SD=3.2]) divided into two sex-matched groups. A 2-factor 8-item model was extracted from the first group using exploratory factor analysis. However, confirmatory factor analysis with the second group showed superior fit to the data using a precedent 2-factor 6-item model, demonstrating factorial invariance across response options. Comprehensive results, implications, and directions for future research are discussed.

Depression, anxiety, and somatoform disorders: vague or distinct categories in primary care? Results from a large cross-sectional study

OBJECTIVE

Depression, anxiety, and somatization are the most frequently observed mental disorders in primary health care. Our main objective was to draw on the often neglected general practitioners' (GPs) perspective to investigate what characterizes these three common mental diagnoses with regard to creating more suitable categories in the DSM-V and ICD-11.

METHODS

We collected independent data from 1751 primary care patients (participation rate=77%) and their 32 treating GPs in Germany. Patients filled out validated patient self-report measures for depression (PHQ-9), somatic symptom severity (PHQ-15), and illness anxiety (Whiteley-7), and questions regarding coping and attribution of illness. GPs' clinical diagnoses and associated features were assessed.

RESULTS

Patients diagnosed by their GPs with depression, anxiety, and/or somatoform disorders were significantly older, less educated, and more often female than the reference group not diagnosed with a mental disorder. They had visited the GP more often, had a longer duration of symptoms, and were more often under social or financial stress. Among the mental disorders diagnosed by the GPs, depression (OR=4.4; 95% CI=2.6 to 7.5) and comorbidity of somatoform, depressive, and anxiety disorders (OR=9.5; 95% CI=4.6 to 19.4) were associated with the largest degrees of impairment compared to the reference group. Patients diagnosed as having a somatoform/functional disorder only had mildly elevated impairment on all dimensions (OR=2.0; 95% CI=1.4 to 2.7). Similar results were found for the physicians' attribution of psychosocial factors for cause and maintenance of the disease, difficult patient-doctor relationship, and self-assessed mental disorder.

CONCLUSION

In order to make the DSM-V and ICD-11 more suitable for primary care, we propose providing appropriate diagnostic categories for (1) the many mild forms of mental syndromes typically seen in primary care; and (2) the severe forms of comorbidity between somatoform, depressive, and/or anxiety disorder, e.g., with a dimensional approach.

Somatoform disorders and recent diagnostic controversies

Classification is not a trivial matter. In Burmese Days, George Orwell writes, "It is devilish to suffer from a pain that is all but nameless. Blessed are they who are stricken only with classifiable diseases! Blessed are the poor, the sick, the crossed in love, for at least other people know what is the matter with them and will listen to their belly-achings with sympathy." Patients who have somatoform disorders are particularly susceptible to this Orwellian lamentation. They are afflicted by symptoms that defy simple explanations. As detailed in this article, there is a spectrum of medical and psychiatric factors that can cause or contribute to somatic symptom burden. Research is continuing to reveal the central mechanisms that may provide a common pathway for physical and psychologic symptoms. The dualism that places some somatic symptom disorders on Axis I and others on Axis III gradually may fade in the coming decades as what the unifying causes are among common symptoms and the multicausal nature of many symptoms are discovered. Meanwhile, the classification systems should continue to operate on pragmatic principles where mechanistic explanations are lacking. This will allow grouping patients into categories that inform research, scientific and patient communication, prognostication, and clinical management. Coupling a heuristic classification system with evidence-based measures for assessing severity and monitoring treatment outcomes are important steps in the optimal care of symptomatic patients.

The feature-positive effect and hypochondriacal concerns

There is evidence to suggest that people have more problems with processing information that is absent (negative information) than with present (positive) information. This bias of overweighing positive and underweighing negative information has been termed the "feature-positive effect" (FPE). Typically, hypochondriasis is characterized by excessive focusing on bodily complaints (cf. positive information), and at the same time discarding negative medical test results (cf. negative information). It was explored whether the FPE is involved in this pattern. Fifty-three undergraduates completed a measure of hypochondriacal concerns and a general, domain-free test of the FPE. As expected, a positive correlation between the FPE and hypochondriacal concerns was observed. Implications for cognitive-behavioural theory are discussed.

Kritische Überprüfung der Faktorenstruktur und Konstruktvalidität des Whiteley-Index - einem etablierten Screening-Instrument zur Erfassung von Hypochondrie

Zusammenfassung. Theoretischer Hintergrund: Der Whiteley-Index (WI) ist ein international etabliertes Screening-Instrument zur Erfassung von Hypochondrie. Trotz großer Verbreitung herrscht Unklarheit über die faktorielle Struktur und Konstruktvalidität. Fragestellung: Kritische Überprüfung der Faktorenstruktur des WI. Methode: An einer umfangreichen Stichprobe von Studierenden (N = 1302) wurden sechs konkurrierende Modelle zur Faktorenstruktur des WI mittels konfirmatorischer Faktorenanalyse überprüft. Ergebnisse: Eine gute Modellpassung erzielte lediglich eine 2-faktorielle Lösung mit radikal reduzierter Itemanzahl. Auf Grund explorativer Analysen wurde ein alternatives 2-faktorielles Modell mit 10 Items realisiert und an einer zweiten Stichprobe (N = 804) konfirmatorisch repliziert. Zusammenhänge mit konvergenten und diskriminanten Außenkriterien belegen insbesondere die Konstruktvalidität des ersten Faktors “Krankheitsangst“, während der zweite Faktor “Krankheitsüberzeugung und Beschwerden“ abbildet. Schlussfolgerungen: Implikationen der Ergebnisse für die Anwendung des WI werden diskutiert.

Körperbeschwerden und Gesundheitsangst in der Primärmedizin

Zusammenfassung. Patienten mit erhöhter Gesundheitsangst verursachen erhebliche Kosten für das Gesundheitssystem. Die durchgeführten medizinischen Untersuchungen und Behandlungen sind häufig unangemessen, denn in etwa der Hälfte der Fälle liegt den Krankheitsbefürchtungen keine organische Erkrankung zugrunde. Im Rahmen der kontrollierten cluster-randomisierten Studie FUNKTIONAL wurden in 29 Hausarztpraxen bei 1751 Patienten systematisch Gesundheitsangst (Whiteley-7), körperliche und psychische Symptome (PHQ-D) sowie die ärztliche Einschätzung des Hausarztes erfasst. Es fand sich eine verstärkte psychische und globale Funktionsbeeinträchtigung bei Patienten mit erhöhter Gesundheitsangst, die auf Patient- und Arztseite angegeben wird. Psychosoziale Faktoren werden vom Behandler häufiger als für die Erkrankung relevant betrachtet, wenn Patienten erhöhte Gesundheitsangst zeigen. Die Erkennung und Reduktion von Gesundheitsangst in der Allgemeinarztpraxis stellt sich also als relevanter Behandlungsaspekt dar, auch wenn keine hypochondrische Erkrankung im engeren Sinne vorliegt.