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The impact of night shift work on breast cancer
Results from the Burden of Occupational Cancer in Canada Study Background: We estimated the proportion and number of female breast cancer cases in Canada attributable to night shift work, a probable cause of breast cancer. Methods: Levin's equation was used to calculate population attributable fractions (PAFs) among Canadian women who ever worked night/rotating shifts from 1961 to 2000, accounting for labor turnover and survival to the year 2011. The calculated PAFs were applied to 2011 Canadian breast cancer incidence statistics to obtain the number of attributable cases. Results: Approximately...
Adverse effect of long work hours on incident diabetes in 7065 Ontario workers followed for 12 years
Objective: According to the International Diabetes Federation, the most important challenge for prevention is now to identify social and environmental modifiable risk factors of diabetes. In this regard, long work hours have recently been linked with diabetes, but more high-quality prospective studies are needed. We evaluated the relationship between long work hours and the incidence of diabetes among 7065 workers over a 12-year period in Ontario, Canada. Research: design and methods Data from Ontario respondents (35–74 years of age) to the 2003 Canadian Community Health Survey were prospectively...
Work stress and risk of death in men and women with and without cardiometabolic disease
A multicohort study Background: Although some cardiovascular disease prevention guidelines suggest a need to manage work stress in patients with established cardiometabolic disease, the evidence base for this recommendation is weak. We sought to clarify the status of stress as a risk factor in cardiometabolic disease by investigating the associations between work stress and mortality in men and women with and without pre-existing cardiometabolic disease. Methods: In this multicohort study, we used data from seven cohort studies in the IPD-Work consortium, initiated between 1985 and 2002 in Finland...
Night Shift Work Increases the Risks of Multiple Primary Cancers in Women
A Systematic Review and Meta-analysis of 61 Articles A growing number of studies have examined associations between night shift work and the risks of common cancers among women, with varying conclusions. We did a meta-analysis to identify whether long-term night shift work increased the risks of common cancers in women. We enrolled 61 articles involving 114,628 cases and 3,909,152 participants from Europe, North America, Asia, and Australia. Risk estimates were performed with a random-effect model or a fixed-effect model. Subgroup analyses and meta-regression analyses about breast cancer were conducted...
Night Shift Work Increases the Risks of Multiple Primary Cancers in Women
A Systematic Review and Meta-analysis of 61 Articles A growing number of studies have examined associations between night shift work and the risks of common cancers among women, with varying conclusions. We did a meta-analysis to identify whether long-term night shift work increased the risks of common cancers in women. We enrolled 61 articles involving 114,628 cases and 3,909,152 participants from Europe, North America, Asia, and Australia. Risk estimates were performed with a random-effect model or a fixed-effect model. Subgroup analyses and meta-regression analyses about breast cancer were conducted...
Outdoor Light at Night and Breast Cancer Incidence in the Nurses’ Health Study II
Background: Animal and epidemiologic studies suggest that exposure to light at night (LAN) may disrupt circadian patterns and decrease nocturnal secretion of melatonin, which may disturb estrogen regulation, leading to increased breast cancer risk.Objectives: We examined the association between residential outdoor LAN and breast cancer incidence using data from the nationwide U.S.-based Nurses' Health Study II cohort.Methods:We followed 109,672 women from 1989 through 2013. Cumulative LAN exposure was estimated using time-varying satellite data for a composite of persistent nighttime illumination...
Does influence at work modify the relation between high occupational physical activity and risk of heart disease in women?
Purpose: To investigate whether influence at work modifies the association between demanding and strenuous occupational physical activity (OPA) and risk of ischaemic heart disease (IHD). Methods: A sample of 12,093 nurses aged 45–64 years from the Danish Nurse Cohort Study was followed for 20.6 years by individual linkage to incident IHD in the Danish National Patient Registry. Information on OPA, influence at work, other occupational factors and known risk factors for IHD was collected by self-report in 1993. Results: During follow-up 869 nurses were hospitalised with incident IHD. Nurses...
Occupational factors and markers of ovarian reserve and response among women at a fertility centre
Objectives: To explore whether work schedules and physically demanding work were associated with markers of ovarian reserve and response. Methods: This analysis included women (n=473 and n=313 for ovarian reserve and ovarian response analysis, respectively) enrolled in a prospective cohort study of couples presenting to an academic fertility centre (2004-2015). Information on occupational factors was collected on a take-home questionnaire, and reproductive outcomes were abstracted from electronic medical records. Generalised linear models and generalised linear mixed models were used to evaluate...
Chronic Disease Risks From Exposure to Long-Hour Work Schedules Over a 32-Year Period
Objectives: This study aims at evaluating the chronic disease risk related to prolonged work in long-hour schedules for eight major chronic diseases: heart disease, non-skin cancer, arthritis, diabetes, chronic lung disease, asthma, chronic depression, and hypertension. Methods: The study used data from the National Longitudinal Survey of Youth, 1979 covering 32 years of job history (1978 to 2009) for 7492 respondents. Logistic regression analyses were performed to test the relationship between average weekly work hours, and the reported prevalence of those conditions for each individual. Results...
Job strain and informal caregiving as predictors of long-term sickness
A longitudinal multi-cohort study This study is the first to investigate the joint effects of job strain and informal caregiving on long-term sickness absence. The main finding was that informal caregiving responsibilities and/or high job strain predicted long-term sickness absence among women. Source: Mortensen J, Dich N, Lange T, Alexanderson K, Goldberg M, Head J, Kivimäki M, Madsen IEH, Rugulies R, Vahtera J, Zins M, Rod NH. Scand J Work Environ Health . http://dx.doi.org/10.5271/sjweh.3587
L’effet des contraintes physiques du travail sur les maladies cardiovasculaires chez les femmes
Enquête Santé et itinéraire professionnel, vagues 2006 et 2010, France En France, les maladies cardiovasculaires (MCV) représentent la première cause de mortalité chez les femmes. Le rôle du milieu professionnel dans l'apparition de ces pathologies est peu documenté. L'objectif de cette étude est d'évaluer l'effet de l'exposition aux contraintes physiques du travail sur la déclaration de MCV chez les femmes. Source: http://www.invs.sante.fr/beh/2016/7-8/2016_7-8_7.html
Work schedule and physically demanding work in relation to menstrual function
The Nurses' Health Study 3 Objectives : This study aimed to evaluate occupational exposures and menstrual cycle characteristics among nurses. Methods : Using cross-sectional data collected in 2010–2012 from 6309 nurses aged 21–45 years, we investigated nurses' menstrual function in the Nurses' Health Study 3. We used multivariable regression modeling to analyze the associations between occupational exposures and prevalence of irregular cycles and long and short cycle lengths. Results : The cohort reported cycle length as <21 (1.5%), 21–25 (15.6%), 26–31 (69...
Gender, Job Authority, and Depression
Using the 1957–2004 data from the Wisconsin Longitudinal Study, we explore the effect of job authority in 1993 (at age 54) on the change in depressive symptoms between 1993 and 2004 (age 65) among white men and women. Within-gender comparisons indicate that women with job authority (defined as control over others' work) exhibit more depressive symptoms than women without job authority, whereas men in authority positions are overall less depressed than men without job authority. Between-gender comparisons reveal that although women have higher depression than men, women's disadvantage...
High occupational physical activity and risk of ischaemic heart disease in women
The interplay with physical activity during leisure time BACKGROUND: Recent studies indicate that physically demanding work is a risk factor for heart disease among men, especially those with low or moderate physical activity during leisure time. Among women, present evidence is inconclusive. DESIGN: The design was a prospective cohort study. METHODS: This investigation in the Danish Nurse Cohort Study included 12,093 female nurses aged 45-64 years, who answered a self-report questionnaire on physical activity at work and during leisure time, known risk factors for ischaemic heart disease (IHD...
For better or worse? Changing shift schedules and the risk of work injury among men and women
Objectives: The aim of this study was to examine the risk of work injury associated with changes in shift schedules and identify whether work injury risks differ between men and women. Methods: Longitudinal panels from the Survey of Labor and Income Dynamics were used to describe work schedule patterns over a 6-year period among a representative sample of Canadian workers (N=19 131). Cox regression was used to estimate the risk of work injury among workers who (i) switched from regular day to nonstandard shifts, (ii) switched from nonstandard to day shifts and (iii) remained in nonstandard shifts...
The impact of job stress due to the lack of organisational support on occupational injury
OBJECTIVES : The aim of this study was to analyse the association between job stress and occupational injuries. METHODS : A prospective cohort study in a sample of 10 667 workers belonging to the insured population of the Mutual Insurance Company in Spain. Job stress was assessed with the Spanish version of the Job Stress Survey. A 1-year follow-up of the workers' clinical records was conducted to determine the incidence of occupational injuries, and the incidence rate per 1000 workers-year was calculated. The associations between the incidence of occupational injuries, job stress and job stress...
Genre : des inégalités de santé et de conditions de travail ?
Depuis 10 ans, l'analyse des statistiques d'accidents du travail, de trajet et de maladies professionnelles montre des évolutions différenciées selon le sexe. Si en 2010, les accidents du travail des femmes représentent un tiers des 650 000 accidents du travail, leur nombre a augmenté de 23% sur la période 2000-2010, alors que le nombre d'accidents du travail des hommes a diminué de 21%. En 2009, pour la 1ère fois, les accidents de trajet des femmes dépassent ceux des hommes. En 2010, pour la 1ère fois, le nombre...
Breast cancer among shift workers: results of the WOLF longitudinal cohort study
Objective: The aim of this study was to investigate whether shift work (with or without night work) is associated with increased risk of breast cancer. Methods : The population consisted of 4036 women. Data were obtained from WOLF (Work, Lipids, and Fibrinogen), a longitudinal cohort study. Information about baseline characteristics was based on questionnaire responses and medical examination. Cancer incidence from baseline to follow-up was obtained from the national cancer registry. Two exposure groups were identified: shift work with and without night work. The group with day work only was used...
Job strain linked to circulatory disease in women
A major US study has linked high strain, active jobs to a significantly higher risk of cardiovascular disease (CVD) in female health professionals. The study examined the relationship between job strain and job insecurity and rates of CVD among the 22,086 participants in the Women's Health Study (WHS). The authors, writing in the online journal PLoS ONE, note: 'This 10 year prospective study of female health professionals revealed that women with active jobs (high demand, high control) and high strain (high demand, low control) were 38 per cent more likely to experience a first CVD event...
Characteristics of the Million Women Study participants who have and have not worked at night
The aim of this study was to compare the characteristics of women who had and had not worked at night in terms of their risk factors for common disease, indicators of general health, social activities, employment, and sleep behavior. Source : http://dx.doi.org/10.5271/sjweh.3313
Nested case–control study of night shift work and breast cancer risk among women in the Danish military
Objectives : Growing but limited evidence suggests that night shift work is associated with breast cancer. The authors conducted a nationwide case–control study nested within a cohort of 18?551 female military employees born in 1929–1968 to investigate the risk for breast cancer after night shift work and to explore the role of leisure time sun exposure and diurnal preference. Methods : The authors documented 218 cases of breast cancer (1990–2003) and selected 899 age-matched controls from the cohort by incidence density sampling. Information on shift work, sun exposure habits...
Circadian gene expression in peripheral blood leukocytes of rotating night shift nurses
Objective : It has been hypothesized that the underlying mechanism of elevated breast cancer risk among long-term, night-working women involves circadian genes expression alteration caused by exposure to light at night and/or irregular work hours. The aim of the present study was to determine the effect of rotating night shift work on expression of selected core circadian genes. Methods : The cross-sectional study was conducted on 184 matched nurses and midwives, who currently work either day or rotating night shifts, to determine the effect of irregular work at night on circadian gene expression...
Association between change in employment status and new-onset depressive symptoms in South Korea
A gender analysis Objectives: This study aimed to investigate the association of change in employment status with new-onset depressive symptoms, particularly differences stemming from workers' gender, in South Korea. Methods: We analyzed data from the ongoing Korean Welfare Panel Study. After excluding participants who had depressive symptoms at baseline (2007), we analyzed 2891 participants who became a precarious or permanent worker or unemployed at follow-up (2008) among waged workers who were permanent or precarious workers at baseline. Workers were classified as permanent workers if they...
Work at night and breast cancer
Report on evidence-based options for preventive actions In 2007, the International Agency for Research on Cancer classified shift work involving circadian disruption as probably carcinogenic to humans (group 2A), primarily based on experimental and epidemiologic evidence for breast cancer. In order to examine options for evidence-based preventive actions, 16 researchers in basic, epidemiological and applied sciences convened at a workshop in Copenhagen 26–27 October 2011. This paper summarizes the evidence from epidemiological and experimental studies and presents possible recommendations...
Bullying at work and onset of a major depressive episode among Danish female eldercare workers
Objective The aim of this study was to analyze whether exposure to workplace bullying among 5701 female employees in the Danish eldercare sector increases the risk of onset of a major depressive episode (MDE). Methods Participants received questionnaires in 2004–2005 and again in 2006–2007. MDE was assessed with the Major Depression Inventory. We examined baseline bullying as a predictor of onset of MDE at follow-up using multiple logistic regression. We further conducted a cross-sectional analysis at the time of follow-up among participants who at baseline were free of bullying, MDE...
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