Sex differences in the risk of coronary heart disease associated with socioeconomic status in Turkey

Background

Studies in high-income countries have demonstrated that low SES status is associated with increased risk of CHD, with sex differences in the risk profiles. Recent evidence suggests that this association may differ in middle-income countries.

Methods

The database of the Chronic Diseases and Risk Factors Survey In Turkey from 2013 and 2019 was used. Education level and employment status were chosen as proxy indicators for SES. Cox regression analyses were conducted to assess the effect of SES on incident CHD controlled by age, settlement, behavioral and biological risk factors. Interaction terms were introduced to the Cox models to assess multiplicative interaction between sex and SES on the occurrence of stroke.

Results

The study included 13 975 participants (7 450 females (53.3%) and 6525 males (46.7%)). During 74.2±9.87 months of follow-up, 474 CHD cases occurred among females (10.28 cases per 1000 person-year) and 445 CHD cases occurred among males (11.05 cases per 1000 person-year). Incident CHD was not associated with education level among either sex. Retirement was associated with increased risk of CVD (HR = 1.31, 95%Cl: 1.18-1.66) among males. Both retirement (HR = 2.12, 95%Cl: 1.16-3.88) and unemployment (HR = 1.93, 95%Cl: 1.14-3.25) were associated with increased risk of CHD in females after adjustment for behavioral and biological risk factors. There was no multiplicative interaction between sex and employment status on the risk of CHD (p = 0.091).

Conclusions

This study of health outcomes in Turkey did not find sex differences in CVD in association with educational status but did show sex differences in association with employment status. This finding suggests that social determinants in middle-income countries may affect men and women differently than in high-income countries.

Key messages

Social determinants in middle-income countries may affect men and women differently with regards to the risk of CHD than in high-income countries. Employment status can predict the risk of CHD in middle-income countries.

Sex differences in the associations of socioeconomic status with stroke in the Turkish Population

Background

Low SES status is associated with the risk of stroke, with sex differences in the risk profiles. Recent evidence suggests that this association may differ in middle-income countries. We explored this association in the Turkish population.

Methods

The database of the Chronic Diseases and Risk Factors Survey in Turkey from 2013 and 2019 was used. The education level and employment status of the participants were chosen as a proxy indicator for SES. Cox regression analyses were conducted to assess the effect of SES on incident stroke controlled by age, settlement, behavioral and biological risk factors. Interaction terms were introduced to the Cox models to assess the multiplicative interaction between sex and SES on the risk of stroke.

Results

The study included 13 975 participants; 7 450 females (53.3%) and 6525 males (46.7%). During 74.2±9.87 months of follow-up, 108 strokes occurred among females (2.34 cases per 1000 person-years) and 81 stroke cases occurred among males (2.01 cases per 1000 person-years). Completion of primary school education was associated with decreased risk of stroke (HR = 0.46, 95%Cl: 0.25-0.84) among males. Education level had a linear protective effect against stroke among females after adjustment for behavioral and biological risk factors (HR = 0.50, 95%Cl: 0.30-0.81; HR = 0.30, 95%Cl: 0.12-0.71; respectively for primary education and secondary or higher education). Employment status did not predict the incident stroke for both sexes. There was no evidence of an interaction between sex and education (p = 0.68).

Conclusions

In this Turkish population, stroke risk was greater in women than in men. Increasing education was associated with a reduced risk of stroke in Turkish women, whereas the only completion of primary education was protective for men, with no further protection at increased educational levels. Further exploration of sex and gender risk differences in moderate-income countries may lead to improved efforts at risk reduction.

Key messages

Education level as a social determinant of health in middle-income countries may affect men and women differently with regards to the risk of stroke Understanding sex differences in the associations of socioeconomic status with stroke may lead to improved efforts at risk reduction of stroke in MICs.

A standard set of person-centred outcomes for diabetes mellitus: results of an international and unified approach

AIMS

To select a core list of standard outcomes for diabetes to be routinely applied internationally, including patient-reported outcomes.

METHODS

We conducted a structured systematic review of outcome measures, focusing on adults with either type 1 or type 2 diabetes. This process was followed by a consensus-driven modified Delphi panel, including a multidisciplinary group of academics, health professionals and people with diabetes. External feedback to validate the set of outcome measures was sought from people with diabetes and health professionals.

RESULTS

The panel identified an essential set of clinical outcomes related to diabetes control, acute events, chronic complications, health service utilisation, and survival that can be measured using routine administrative data and/or clinical records. Three instruments were recommended for annual measurement of patient-reported outcome measures: the WHO Well-Being Index for psychological well-being; the depression module of the Patient Health Questionnaire for depression; and the Problem Areas in Diabetes scale for diabetes distress. A range of factors related to demographic, diagnostic profile, lifestyle, social support and treatment of diabetes were also identified for case-mix adjustment.

CONCLUSIONS

We recommend the standard set identified in this study for use in routine practice to monitor, benchmark and improve diabetes care. The inclusion of patient-reported outcomes enables people living with diabetes to report directly on their condition in a structured way.

Diabetes care in individuals with severe mental Illnesses in Israel

Background

Cardiovascular disease and risk factors are more common in people with severe mental illness (SMI; schizophrenia, schizoaffective disorders, and bi-polar disorders). For instance, diabetes mellitus (DM) prevalence was reported to be 2-3 times higher, with higher incidence and severity of complications. In 2015, following a reform in mental health services in Israel, services were transferred to the responsibility of the health plans, allowing a comprehensive healthcare. We aimed to compare quality of care indicators and intermediate DM outcomes in individuals with SMI compared to the general population.

Methods

The Israel national program for quality indicators in community healthcare obtains data from electronic medical records from the four health plans, covering the entire civilian population. In 2017, n = 74,226 individuals aged ≥18 years had a registered diagnosis of SMI (prevalence 1.37%). DM prevalence, hemoglobin A1c (HbA1c) testing yearly, and DM control in individuals with SMI were compared with the general population.

Results

DM prevalence in adults with SMI in 2017 was 14.3%, compared with 9.7% among all Israeli adults (RR of 1.5). rates of HbA1c testing and control (HbA1c<7-8%, depending on age and duration of disease) were similar among DM patients with SMI and the general population (testing: 90.1% and 90.9%; Control: 70.8% and 69.7%, SMI and general population, respectively); Similarly, uncontrolled DM (HbA1c>9%) was observed in 10.8% of individuals with SMI and in 10.0% of the general population.

Conclusions

Along with the expected excess of DM prevalence in individuals with SMI, quality of care DM indicators rates were alike among those with SMI as in the general population, suggesting non-inferior quality of care. This is consistent with results reported by the British national diabetes audit for England and Wales. However, our results are limited by a possible under-registration or diagnosis of SMI in the Israeli population.

Key messages

Higher diabetes mellitus prevalence is observed in individuals with severe mental illness. Hemoglobin A1c testing and diabetes mellitus control rates are alike in individuals with severe mental illness compared with the general population, suggesting non-inferior quality of care.

A comparison of the effects of maternal anxiety and depression on child development

Background

Most studies on the association between the mental health of mothers and the development of their offspring have focused on maternal depression, but only a few have investigated the association between maternal anxiety and child development. We aimed to compare the associations between maternal depression and anxiety symptoms 6-8 weeks postpartum and infant development at 1 year.

Methods

We conducted a longitudinal study of 396 mother-child dyads. The mothers were recruited after birth in 3 different hospitals in Israel in 2017 and were followed for one year. Mothers were assessed by completing the General Anxiety Disorder-7 (GAD-7) questionnaire and the Edinburgh Postnatal Depression Scale (EPDS) 6-8 weeks postpartum. Child development was assessed by the Ages & Stages Questionnaires (ASQ-3) at 12 months. Multivariate linear regressions were used to explore the relationship between the EPDS and GAD-7 scores and child development, all as continuous variables, adjusting for maternal education, parity, and gender.

Results

Depressive symptoms postpartum were only associated with poor personal-social skills (β=-0.5, 95% CI: -0.91, -0.08). Increasing maternal anxiety was associated with poorer development in communication skills (β =-0.48, 95% CI: -0.93, -0.04), personal-social skills (β =-1.02, 95% CI: -1.58, -0.46), solving problems skills (β =-0.7, 95% CI: -1.27, -0.14) and fine motor skills (β =-0.46, 95% CI: -0.9, -0.02). Neither anxiety nor depressive symptoms were associated with gross motor skills. Controlling for quality of attachment, the associations of depression and anxiety with development were no longer significant, suggesting mediation.

Conclusions

Postpartum anxiety was a stronger predictor of low developmental scores than depression, and associations were probably mediated by impaired attachment. Identifying and supporting mothers experiencing anxiety after birth may mitigate the risk of developmental delays in children.

Key messages

Maternal anxiety was found to be a significant risk factor for developmental delay at 1 year of age. The association between maternal anxiety and child development was probably mediated by attachment.

Diabetes in Israel- do all patients receive equal care?

Background

Diabetes Mellitus (DM) is associated with micro- and macro-vascular complications, leading to high burden of morbidity and mortality. Populations of low socioeconomic position (SEP) in various countries were found to have increased prevalence of the disease, worse glycemic control, and increased complications. We aimed to examine whether there are social disparities in diabetes care in Israel, as reflected in a national program for quality indicators.

Methods

The Israel National Program for Quality Indicators in Community Healthcare obtains data from electronic medical records from all health plans, covering the entire Israeli population. In 2017, 497,397 individuals aged >18 years were identified with DM. DM prevalence, quality of care indicators, including process and intermediate outcomes were explored by SEP categories (1-10), determined according to residential addresses.

Results

DM prevalence in Israeli adults in 2017 was 9.7%, showing a strong SEP gradient, with higher prevalence in individuals of lower SEP. No SEP disparities were observed in process indicators with overall rates of documentation of hemoglobin A1c (HbA1c) of 90.9%, ophthalmologic examinations of 72.5%, and kidney function examinations of 92.5%. However, strong SEP disparities were observed in the prevalence of uncontrolled diabetes (HbA1c≥9%), with an overall rate of 10.0%, and a 5.4-times higher rate in diabetics of the lowest SES level (23.5%) compared with the highest SEP level (4.3%). A somewhat weaker gradient was seen for the well-control of DM (HbA1c<7-8%, according to duration of disease and age), with an overall rate of 69.7%, and a 1.7 ratio, comparing diabetics of the highest vs the lowest SEP level.

Conclusions

These findings suggest that access to care does not explain SEP disparities in diabetes control in Israel. There is a need to explore the underlying social, cultural, and possibly the benefits-policy determinants of poor control among individuals of low SEP.

Key messages

Wide socioeconomic disparities are present among Israeli adults in diabetes mellitus prevalence and control rates, but not in care processes indicators. These findings call for a deeper understanding of the determinants and perhaps a revision of current social benefits policy, which may encourage lack of glycemic control.

Socioeconomic disparities in diabetes prevalence and quality of care among Israeli children

Background

Despite Israel’s universal health coverage, disparities in health services provision may still exist. We aimed to assess socioeconomic disparities in diabetes prevalence and quality of care among Israeli children, and to assess trends in these over time.

Methods

Repeated cross-sectional analyses in the setting of the National Program for Quality Indicators in Community Healthcare that receives data based on electronic medical records from Israel’s four health maintenance organizations. The study population included all Israeli children aged 2-19 years in 2011-2017 (for 2017: N = 2,364,374, including 2,914 with diabetes). Socio-economic position (SEP) was measured using Central Bureau of Statistics data further updated by a private company (Points Business Mapping Ltd), and grouped into 4 categories, ranging from 1 (lowest) to 4 (highest). Using logistic regression, we assessed the association of SEP with diabetes prevalence, diabetes clinic visits, hemoglobin A1C (HbA1C) testing, and poor glycemic control (HbA1C> 9%), and assessed whether these changed over time. Models were adjusted for age, and sex.

Results

Diabetes prevalence increased with age and SEP. SEP was positively associated with visiting a specialized diabetes clinic (OR SEP 4 vs. 1 2.53, 95% CI 1.72 - 3.70). Odds of HbA1C testing and odds of poor glycemic control were negatively associated with SEP (OR SEP 4 vs. 1: 0.54, 95% CI 0.40 - 0.72 and OR SEP 4 vs. 1: 0.25, 95% CI 0.18 - 0.34 respectively). Disparities were especially apparent among children aged 2-9 (4.6% poor glycemic control in SEP 4 vs. 40.8% in SEP 1). Poor glycemic control decreased over time, from 44.0% in 2011 to 34.8% in 2017.

Conclusions

While poor glycemic control rates among children have improved, significant socioeconomic gaps remain. It is eminent to study the causes of these disparities and develop policies to improve care provided to children in the lower SEP levels, to promote health equity.

Key messages

Major socioeconomic inequalities in the control of diabetes among children in Israel remain despite universal health care coverage. The rate of uncontrolled diabetes among Israeli children has improved over time.

Live birth sex ratios and father's geographic origins in Jerusalem, 1964-1976

OBJECTIVE

To examine whether ancestry influenced sex ratios of offspring in a birth cohort before parental antenatal sex selection influenced offspring sex.

METHODS

We measured the sex ratio as the percent of males according to countries of birth of paternal and maternal grandfathers in 91,459 live births from 1964 to 1976 in the Jerusalem Perinatal Study. Confidence limits (CI) were computed based on an expected sex ratio of 1.05, which is 51.4% male.

RESULTS

Of all live births recorded, 51.4% were male. Relative to Jewish ancestry (51.4% males), significantly more males (1,761) were born to Muslim ancestry (54.5, 95% CI = 52.1-56.8, P = 0.01). Among the former, sex ratios were not significantly associated with paternal or maternal age, education, or offspring's birth order. Consistent with a preference for male offspring, the sex ratio decreased despite increasing numbers of births over the 13-year period. Sex ratios were not affected by maternal or paternal origins in North Africa or Europe. However, the offspring whose paternal grandfathers were born in Western Asia included fewer males than expected (50.7, 50.1-51.3, P = 0.02), whether the father was born abroad (50.7) or in Israel (50.8). This was observed for descendents of paternal grandfathers born in Lebanon (47.6), Turkey (49.9), Yemen & Aden (50.2), Iraq (50.5), Afghanistan (50.5), Syria (50.6), and Cyprus (50.7); but not for those from India (51.5) or Iran (51.9). The West Asian group showed the strongest decline in sex ratios with increasing paternal family size.

CONCLUSIONS

A decreased sex ratio associated with ancestry in Western Asia is consistent with reduced ability to bear sons by a subset of Jewish men in the Jerusalem cohort. Lower sex ratios may be because of pregnancy stress, which may be higher in this subgroup. Alternatively, a degrading Y chromosome haplogroup or other genetic or epigenetic differences on male germ lines could affect birth ratios, such as differential exposure to an environmental agent, dietary differences, or stress. Differential stopping behaviors that favor additional pregnancies following the birth of a daughter might exacerbate these lower sex ratios.

Associations of socioeconomic position in childhood and young adulthood with cardiometabolic risk factors: the Jerusalem Perinatal Family Follow-Up Study

BACKGROUND

Several stages in the life course have been identified as important to the development of cardiovascular disease. This study aimed to assess the associations of childhood and adulthood socioeconomic position (SEP) and social mobility with cardiometabolic risk factors (CMRs) later in life.

METHODS

We conducted follow-up examinations of 1132 offspring, aged 32, within a population-based cohort of all births in Jerusalem from 1974 to 1976. SEP was indicated by parents' occupation and education, and adulthood SEP was based on offspring's occupation and education recorded at age 32. Linear regression models were used to investigate the associations of SEP and social mobility with CMRs.

RESULTS

Childhood-occupational SEP was negatively associated with body mass index (BMI; β=-0.29, p=0.031), fat percentage (fat%; β=-0.58, p=0.005), insulin (β=-0.01, p=0.031), triglycerides (β=-0.02, p=0.024) and low-density lipoprotein cholesterol (LDL-C; β=-1.91, p=0.015), independent of adulthood SEP. Adulthood-occupational SEP was negatively associated with waist-to-hip ratio (WHR; β=-0.01, p=0.002), and positively with high-density lipoprotein cholesterol (HDL-C; β=0.87, p=0.030). Results remained similar after adjustment for smoking and inactivity. Childhood-educational SEP was associated with decreased WHR and LDL-C level (p=0.0002), and adulthood-educational SEP was inversely associated with BMI (p=0.001), waist circumference (p=0.008), WHR (p=0.001) and fat% (p=0.0002) and positively associated with HDL-C (p=0.030). Additionally, social mobility (mainly upward) was shown to have adverse cardiometabolic outcomes.

CONCLUSIONS

Both childhood and adulthood SEP contribute independently to CMR. The match-mismatch hypothesis may explain the elevated CMRs among participants experiencing social mobility. Identification of life-course SEP-related aspects that translate into social inequality in cardiovascular risk may facilitate efforts for improving health and for reducing disparities in cardiovascular disease.

Prospective association of serum androgens and sex hormone-binding globulin with subclinical cardiovascular disease in young adult women: the "Coronary Artery Risk Development in Young Adults" women's study

CONTEXT

The role of endogenous androgens and SHBG in the development of cardiovascular disease in young adult women is unclear.

OBJECTIVE

Our objective was to study the prospective association of serum androgens and SHBG with subclinical coronary and carotid disease among young to middle-aged women.

DESIGN AND SETTING

This was an ancillary study to the Coronary Artery Risk Development in Young Adults (CARDIA) study, a population-based multicenter cohort study with 20 yr of follow-up.

PARTICIPANTS

Participants included 1629 women with measurements of serum testosterone and SHBG from yr 2, 10, or 16 and subclinical disease assessment at yr 20 (ages 37-52 yr).

MAIN OUTCOME MEASURES

Coronary artery calcified plaques (CAC) and carotid artery intima-media thickness (IMT) were assessed at yr 20. The IMT measure incorporated the common carotid arteries, bifurcations, and internal carotid arteries.

RESULTS

SHBG (mean of yr 2, 10, and 16) was inversely associated with the presence of CAC (multivariable adjusted odds ratio for women with SHBG levels above the median = 0.59; 95% confidence interval = 0.40-0.87; P = 0.008). SHBG was also inversely associated with the highest quartile of carotid-IMT (odds ratio for women with SHBG levels in the highest quartile = 0.56; 95% confidence interval = 0.37-0.84; P for linear trend across quartiles = 0.005). No associations were observed for total or free testosterone with either CAC or IMT.

CONCLUSION

SHBG levels were inversely associated with subclinical cardiovascular disease in young to middle-aged women. The extent to which low SHBG is a risk marker or has its own independent effects on atherosclerosis is yet to be determined.

Emergency room visit: a red-flag indicator for poor diabetes care

AIM

To determine the association between emergency room (ER) admission and quality of diabetes care in the community.

METHODS

In a nested case-control study of patients with Type 2 diabetes mellitus (DM) within a large health maintenance organization (HMO) in Israel, 919 patients who were admitted to one of West Jerusalem's ERs between 1 May and 30 June 2004 were compared with 1952 control subjects not admitted. Data on study covariates were retrieved from the HMO's computerized database and a subset of the study population was interviewed. Logistic regressions were conducted to estimate the odds ratios of being admitted according to different measures of quality of care, controlling for socio-demographic variables, co-morbidities and type of DM treatment.

RESULTS

The main indices of quality of primary care that were inversely associated with visiting an ER during the study period included performance of a cholesterol test in the year prior to the index date [adjusted odds ratio (OR) 0.23, 95% confidence interval (CI) 0.19-0.29, P < 0.001], performance of glycated haemoglobin test (OR 0.26, 95% CI 0.24-0.29, P < 0.001), visiting an ophthalmologist (OR 0.47, 95% CI 0.32-0.68, P = 0.001), and recommendations to stop smoking (OR 0.10, 95% CI 0.05-0.21, P < 0.001).

CONCLUSIONS

Admission to the ER can be used as an indicator for poor quality of diabetes care. There is an association between ER admission and poor quality of diabetes care.

Preeclampsia risk in relation to maternal mood and anxiety disorders diagnosed before or during early pregnancy

BACKGROUND

Mood and anxiety disorders are common, debilitating psychiatric illnesses that disproportionally affect women of childbearing age. Relatively few studies have evaluated the extent to which, if at all, maternal mood and anxiety disorders are risk factors for preeclampsia, and results from available studies are inconsistent. We examined the risk of preeclampsia in relation to maternal medical history of mood and anxiety disorders.

METHODS

We used data from a cohort study of 2,601 pregnant women. Maternal pregestational and early pregnancy (before completion of 20 weeks gestation) psychiatric diagnoses were ascertained from medical records. Generalized linear regression procedures were used to derive relative risk (RR) estimates and 95% confidence intervals (CIs).

RESULTS

A positive history of maternal mood or anxiety disorder was associated with a 2.12-fold increased risk of preeclampsia after adjustment for age, race/ethnicity, and pre-pregnancy body mass index (95% CI 1.02-4.45). The risk of preeclampsia appeared to be more strongly related with maternal mood or anxiety disorders first diagnosed during the index pregnancy (adjusted RR = 3.64; 95% CI 1.13-11.68). The corresponding RR for maternal mood and anxiety disorders diagnosed before pregnancy was 1.73 (95% CI 0.71-4.20).

CONCLUSIONS

Maternal mood and anxiety disorders are associated with increased preeclampsia risk. These observations must be explored in larger pharmacoepidemiological studies that allow precise evaluations of independent and joint effects of maternal psychopathologies and the use of psychotropic medications on preeclampsia risk.

Cancer risk after exposure to treatments for ovulation induction

Uncertainty continues as to whether treatments for ovulation induction are associated with increased risk of cancer. The authors conducted a long-term population-based historical cohort study of parous women. A total of 15,030 women in the Jerusalem Perinatal Study who gave birth in 1974-1976 participated in a postpartum survey. Cancer incidence through 2004 was analyzed using Cox's proportional hazards models, controlling for age and other covariates. Women who used drugs to induce ovulation (n = 567) had increased risks of cancer at any site (multivariate hazard ratio (HR) = 1.36, 95% confidence interval (CI): 1.06, 1.74). An increased risk of uterine cancer was found among women treated with ovulation-inducing agents (HR = 3.39, 95% CI: 1.28, 8.97), specifically clomiphene (HR = 4.56, 95% CI: 1.56, 13.34). No association was noted between use of ovulation-inducing agents and ovarian cancer (age-adjusted HR = 0.61, 95% CI: 0.08, 4.42). Ovulation induction was associated with a borderline-significant increased risk of breast cancer (multivariate HR = 1.42, 95% CI: 0.99, 2.05). Increased risks were also observed for malignant melanoma and non-Hodgkin lymphoma. These associations appeared stronger among women who waited more than 1 year to conceive. Additional follow-up studies assessing these associations by drug type, dosage, and duration are needed.

Twin pregnancy and the risk of schizophrenia

BACKGROUND

Twins are exposed to intrauterine environments that differ significantly from those of singletons. These diverse environments might alter the risk for schizophrenia in twins and make it difficult to generalize from findings in twins when studying the risk of schizophrenia in the general population. Previous studies report contradictory findings on the risk for schizophrenia in twins.

METHODS

We studied the incidence of schizophrenia spectrum disorders, ascertained from Israel's National Psychiatric Registry, in a cohort of 2124 twins and 87,955 singletons. These offspring were followed from their birth in 1964-76 in the Jerusalem Perinatal study. Cox proportional hazards methods were used to compare outcomes over 28-41 years, adjusting for ages of parents.

RESULTS

Twins showed a relative risk [RR] of .84 relative to singletons, with a 95% confidence interval [CI] of (.51-1.4). RRs and CIs for males and females were .68 [.34-1.4] and 1.1 [.55-2.2] respectively. Twins in male-male, female-female or opposite-sex sets showed no significant variation in RRs; furthermore, first- or second-born twins did not differ significantly from each other. Siblings of twins had the same risk of schizophrenia as siblings of singletons.

CONCLUSION

Twins have the same risk for schizophrenia as the general population.

Paternal age and twinning in the Jerusalem Perinatal Study

OBJECTIVE

To investigate whether incidence of twin deliveries is related to father's age, independently of mother's age, and whether it differs for same-sex or opposite-sex twin sets.

STUDY DESIGN

In a program of research on effects of paternal age, this study used data from a prospective cohort of 92,408 offspring born in Jerusalem from 1964 to 1976. Of the 91,253 deliveries in the Jerusalem Perinatal Study, 1115 were twin deliveries. The data were analyzed with General Estimate Equations to inform unconditional logistic regression.

RESULTS

After controlling for maternal age, odds ratios (ORs) and 95% confidence intervals (95% CI) associated with father's ages 25-34 and 35+ were 1.3 (1.1, 1.7) and 1.5 (1.2, 2.1) respectively, compared with fathers <25 years old. The effect of maternal age was partly explained by paternal age. The ORs for opposite-sex twin sets and male-male twin sets increased slightly with paternal age, while the OR for same-sex and female-female twin decreased.

CONCLUSION

Studies of twins are used to estimate effects of genes and environment in a variety of diseases. Our findings highlight the need to consider paternal as well as maternal age when analyzing data on twins to explore etiology of diseases.

Consanguinity and birth defects in the jerusalem perinatal study cohort

BACKGROUND

While parental consanguinity is known to increase the risk of birth defects in offspring, it is hard to quantify this risk in populations where consanguinity is prevalent.

METHODS

To support ongoing studies of cancer and of psychiatric disease, we studied relationships of consanguinity to 1,053 major birth defects in 29,815 offspring, born in 1964-1976. To adjust for confounding variables (geographic origin, social class and hospital), we constructed logistic regression models, using GEE to take into account correlations between sibs. Odds ratios (ORs) and 95% confidence limits were estimated in comparison to a reference group of offspring with grandfathers born in different countries.

RESULTS

With 10.1% of offspring having consanguineous parents, the adjusted OR for major birth defect was 1.41 (1.12-1.74). Offspring of marriages between uncles-nieces, first cousins and more distant relatives showed adjusted ORs of 2.36 (0.98-5.68), 1.59 (1.22-2.07) and 1.20 (0.89-1.59) respectively. For descendents of grandfathers born in the same country, but not known to be related, the OR was 1.05 (0.91-1.21); these showed increased risk associated with ancestries in Western Asia (1.27, 1.04-1.55, p < 0.02) or Europe (1.13, 0.79-1.80).

CONCLUSIONS

A strong association of consanguinity with poverty and low education points to the need to avoid exposure to environmental hazards in these families.

Gestational diabetes and the risk of breast cancer among women in the Jerusalem Perinatal Study

Gestational diabetes is becoming increasingly common; it is important to determine how it relates to future risk of disease. We investigated the relation of gestational diabetes to breast cancer in 37,926 women who had one or more live births in 1964-1976 for whom information had been collected on complications of pregnancy. In this cohort there were 1,626 cases of breast cancer reported to the Israel Cancer Registry before January 1, 2005 and 410 cases of gestational diabetes recorded from birth records. There were 29 cases of breast cancer among women diagnosed with gestational diabetes. Using Cox proportional hazards models to control for age and birth order at the first observed birth and other characteristics, we found that the incidence of breast cancer was increased among women diagnosed with gestational diabetes (relative rate = 1.5, 95% confidence interval 1.0-2.1). This effect was seen only among women 50 years and older (relative rate 1.7, 95% confidence interval 1.1-2.5) but not among women <50 (relative rate = 1.0, 95% confidence interval 0.5-2.1). The findings suggest that gestational diabetes may be an important early marker of breast cancer risk among post-menopausal women, but these results need to be confirmed in future studies.

A large-scale gastroenteritis outbreak associated with Norovirus in nursing homes

An increase in gastroenteritis outbreaks due to Norovirus has been reported worldwide. We investigated a large-scale outbreak affecting 246 residents and 33 staff members in six nursing homes in the Tel-Aviv district, Israel, during 3 weeks in 2002. Person-to-person spread was noticed in all nursing homes. The spread of disease could not be attributed to social interactions. Among the elderly residents, the hospitalization rate was 10.2% and the case-fatality rate was 2.0%. Bacteriological cultures were negative. Overall, 7 out of 15 stool specimens were positive for Norovirus by RT-PCR. All were sequenced and found to be 90% identical. The characteristics of this outbreak and the RT-PCR results suggest that illness was caused by Norovirus. Due to the high case-fatality rate of Norovirus gastroenteritis, there should be a high index of suspicion when encountering a gastroenteritis outbreak among the elderly. This will enable prompt action to stop the spread of illness.