Relationship between cumulative exposure to occupational lifting throughout working life and risk of ischemic heart disease in men and women. The Copenhagen Aging and Midlife Biobank.

Ischemic heart disease (IHD) causes mortality and morbidity. High levels of occupational physical activity (OPA) increases IHD risk, and occupational lifting (OL) is suggested as a detrimental OPA exposure. This study investigated the association between accumulated OL throughout working life, and risk for IHD, and potential sex and hypertension differences. Data from Copenhagen Ageing and Midlife Biobank linked to register-based information on incident IHD during 9 years follow-up in the Danish National Patient Registry were included. The outcome was the odds of IHD from baseline (2009-2011) to end of follow-up (2018), among participants without IHD at baseline. Accumulated OL was assessed by linking occupational codes to a Job Exposure Matrix, creating a measure in ton-years (lifting 1,000 kg/day/year). Multivariable logistic regression tested associations between level of accumulated OL and IHD, among the 6,606 included individuals (68% men). During follow-up, 7.3% men and 3.6% women were hospitalized with IHD. Among all participants, the odds for IHD were 47% (OR 1.47, 95% CI 1.05-2.06) higher among those with ≥5 to <10 ton-years, 39% (OR 1.39, 95% CI 1.06-1.83) higher among those with ≥10 to <30 ton-years, and 62% (OR 1.62, 95% CI 1.18-2.22) higher among those with ≥30 ton-years, compared to no accumulated OL. However, these increased odds were in the same direction in the fully-adjusted model but statistically insignificant, ≥5 to <10 ton-years OR 1.28, 95% CI 0.88-1.88; ≥10 to <30 ton-years OR 1.20, 95% CI 0.85-1.69; and ≥30 ton-years OR 1.22, 95% CI 0.81-1.84. No statistically significant interactions, nor any associations, between OL and sex, or hypertension were seen.

Are repeated assisted reproductive technology treatments and an unsuccessful outcome risk factors for unipolar depression in infertile women?

INTRODUCTION: Previous studies have shown conflicting results as to whether unsuccessful medically assisted reproduction is a risk factor for depression among women. This study therefore investigated if women with no live birth after assisted reproductive technology (ART) treatment had a higher risk of unipolar depression compared with women with a live birth after ART treatment. MATERIAL AND METHODS: The Danish National ART-Couple (DANAC) Cohort is a national register-based cohort study that consists of women who received ART treatment from 1 January 1994 to 30 September 2009, in Denmark (n = 41 050). Information on unipolar depression was obtained from the Danish Psychiatric Central Research Register. The analyses were conducted in Cox regression analysis. RESULTS: During the 308 494 person-years of follow up, 552 women were diagnosed with unipolar depression. A Cox proportional hazards model showed that women in ART treatment, with no live birth yet, had a lower risk of unipolar depression compared with women with a live birth. Women had the highest risk of unipolar depression 0-42 days after a live birth (adjusted hazard ratio 5.08, 95% CI 3.11-8.29) compared with women with no live birth. A lower, but still increased, risk of unipolar depression, was found in women 43 days to 1 year and >1 year after a live birth compared with women with no live birth yet. CONCLUSIONS: Motherhood is an important trigger of unipolar depression in women conceiving after ART treatment.

Assisted reproductive technology treatment in women with severe eating disorders: a national cohort study.

INTRODUCTION: This national retrospective cohort study investigates the prevalence of women with severe eating disorders in assisted reproductive technology (ART) treatment compared with an age-matched background population without ART treatment. It assesses the frequency distribution of the first and last eating disorder diagnosis before, during, and after ART treatment, and evaluates differences in obstetric outcomes between women with and without a severe eating disorder. MATERIAL AND METHODS: Hospital-diagnosed eating disorders among 42,915 women in the Danish National ART cohort (DANAC), registered during 1994-2009 in the mandatory Psychiatric Central Research Register, were compared with a non-eating disorder ART cohort of 42,644 women and an age-matched background population of 215,290 women without a history of ART treatment for the main outcome measures prevalence of eating disorders, frequency distribution of diagnoses before/during/after ART treatment, as well as ART treatment and obstetric outcomes. RESULTS: In the ART cohort, 271 women (0.63%) had an eating disorder diagnosis compared with 0.73% in the background population (p = 0.025). The prevalence of ovulatory disorder was significantly higher in women with a severe eating disorder compared with the ART cohort without eating disorders. Obstetric outcomes were similar in ART-treated women with and without an eating disorder. CONCLUSION: Women with severe eating disorders were identified in the ART cohort, although significantly less often than in the age-matched background population. Women with severe eating disorders suffered more often from anovulatory infertility than the ART comparison cohort without this disease. Obstetric outcomes appeared reassuring in the ART cohort with eating disorders.

Assisted reproductive technology (ART) treatment in women with schizophrenia or related psychotic disorder: a national cohort study.

OBJECTIVES: To determine the prevalence rate of women with a diagnosis of schizophrenia or related psychotic disorder in assisted reproductive technology (ART) treatment and to study these women's fertility treatment outcome in comparison to women with no psychotic disorders. STUDY DESIGN: We used a national register-based cohort of 42,915 Danish women in ART treatment from 1.1.1994 to 30.9.2009. All women with a diagnosis of schizophrenia or related psychotic disorders before, during or after their ART treatment were identified by individual-level linkage of nationwide registers of ART treatment, psychiatric admission, birth and socio-demographic status. The comparison group (N=42,671) consisted of all women in the study cohort never diagnosed with psychotic disorders. Conventional descriptive methods were used for the statistical analyses. RESULTS: Two hundred and forty-four (0.6%) women in the study cohort received a diagnosis of psychotic disorder before (N=135-55.3%), during (N=7-2.9%) or after (N=102-41.8%) ART treatment. The mean time from last diagnosis of psychotic disorder to their first ART treatment in the 135 women with a psychiatric diagnosis prior to their first ART treatment was 7.1 ± 5.6 years (25-75% percentile: ±2.8-10.4 years). The most frequent diagnoses were acute and transient psychotic disorder. Women with a diagnosis of schizophrenia or related psychotic disorder before their first ART treatment had a lower ART treatment success rate as significantly fewer women obtained a live birth (40.0% vs. 51.9%, P<0.01). However, we found no statistical differences in perinatal outcomes for the children born by women in the study population and comparison group. CONCLUSIONS: The prevalence of women with a psychotic diagnosis in fertility treatment is lower than the prevalence in the general population. Women with a psychotic disorder prior to ART treatment have a lower fertility treatment success rate compared to women without psychotic disorder. Women with a psychotic disorder achieving delivery show similar obstetric outcomes to women with no psychotic disorder.

Addressing social inequality in aging by the Danish occupational social class measurement.

OBJECTIVE: To present the Danish Occupational Social Class (DOSC) measurement as a measure of socioeconomic position (SEP) applicable in a late midlife population, and to analyze associations of this measure with three aging-related outcomes in midlife, adjusting for education. METHOD: Systematic coding procedures of the DOSC measurement were applied to 7,084 participants from the Copenhagen Aging and Midlife Biobank (CAMB) survey. We examined the association of this measure of SEP with chronic conditions, self-rated health, and mobility in logistic regression analyses, adjusting for school education in the final analysis. RESULTS: The measure of SEP showed a strong social gradient along the social classes in terms of prevalence of chronic conditions, poor self-rated health, and mobility limitations. Adjusting for school education attenuated the association only to a minor degree. DISCUSSION: The DOSC measure was associated with aging-related outcomes in a midlife Danish population, and is, thus, well suited for future epidemiological research on social inequalities in health and aging.

Economic consequences of incident disease: the effect on loss of annual income.

AIMS: To estimate the effect of incident disease on loss of annual income on an individual level, to analyse whether loss of job mediates the effect on loss of annual income, to analyse whether an association is modified by socioeconomic position, and to determine whether the effect on annual income is similar across three different diagnostic categories with different consequences in terms of functional limitations. METHODS: This was a register-based study with a longitudinal design using a register of the Danish population covering 412,450 person years. Data on hospitalization are linked to information on income and employment. The setting was a 10% random sample of all individuals living in Denmark and aged 43-60 years in 1996-99. RESULTS: Male cases of acute myocardial infarction (AMI), female cases of breast cancer and both male and female cases of intervertebral disease were associated with an increased and equally strong risk for experiencing a loss of annual income corresponding to one income decile (>25,000 DKK) in the year following disease (odds ratio (OR) from 1.37 (95% confidence interval (CI) 1.09-1.72) to 1.57 (95% CI 1.21-2.04)). No significant effect of female AMI was found. The effects of intervertebral disease and male AMI were mediated by loss of employment. This was not the case for breast cancer. No modifying effects of income level or occupational class were found. CONCLUSIONS: Despite different functional limitations, the three disorders have equally strong effects on annual income. This might be interpreted as a buffering effect of the welfare policies in relation to the more discriminating demands of the labour market.

Contextual factors and social consequences of incident disease.

BACKGROUND: Large geographical variations in the incidence of disability benefits have been reported, but it is unclear to what extent that is confounded by variations in disability rates and disease pattern in the population and whether local variations in rehabilitation and health insurance practice modify the employment effect of disease. We have studied risk of labour market exclusion following incident hospitalization for ischaemic heart disease (IHD), and whether this risk may be modified by contextual factors on the municipal level. METHODS: A cohort design on a 10% random sample of the whole Danish population including individuals aged 43-60 years, (n = 516.454 person-years including 840 cases of IHD). The independent variable was incident hospitalization for IHD and outcome variable was defined as job loss 2 years after the event. Regional-level data included all the 275 Danish municipalities in 1996. RESULTS: There was a strong association between incident IHD and labour market exclusion 2 years later, odds ratio (OR) = 2.8 (95% confidence intervals (CI) 2.4-3.4). Men had less risk of being excluded than women and immigrant status, low-educational attainment and co-morbidity were significantly associated with job loss. Also, regional characteristics did independently effect labour market exclusion. However, the individual relative risk of exclusion following incident IHD was not modified substantially when neither the fixed effects of the regional-level variables nor the random effect of municipality was included in the analyses. CONCLUSION: Geographical variation in incidence of labour market exclusion following incident disease is not primarily an effect of differential social consequences across municipal variations in labour market and socio-economic conditions.