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Ségrégation professionnelle entre les femmes et les hommes : quels liens avec le temps partiel ?
La ségrégation professionnelle entre les femmes et les hommes et la concentration du temps partiel dans les métiers féminisés questionnent sur les rôles respectifs des facteurs liés à la demande et à l'offre de travail. Les femmes et les hommes exercent-ils des métiers différents en raison de leurs préférences et attitudes différenciées ou plutôt en raison de mécanismes de sélection sur le marché du travail ? Les femmes exercent-elles de façon privilégiée...
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...
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...
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...
Night shift work and other determinants of estradiol, testosterone, and dehydroepiandrosterone sulfate among middle-aged nurses and midwives
The study examined the association between rotating night shift work and blood concentrations of selected sex hormones among nurses and midwives. A positive and significant association between the total duration of night shift work and estradiol level observed among postmenopausal women tends to support the hypothesis linking night shift work with increased risk of breast cancer. Source: Juvani A, Oksanen T, Virtanen M, Elovainio M, Salo P, Pentti J, Kivimäki M, Vahtera J. Scand J Work Environ Health , 2016. http://dx.doi.org/10.5271/sjweh.3581
Gender-specific association between night-work exposure and type-2 diabetes
Results from longitudinal study of adult health, ELSA-Brasil Objectives Diabetes is a multifactorial disease of increasing prevalence. The literature suggests an impact of night work on metabolic components, though the relationship with diabetes is unclear. Our aim was to investigate gender-specific associations between night work and type-2 diabetes (DM2) or impaired glucose tolerance (IGT) using baseline data of the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil). Methods The cohort comprised 15 105 civil servants, aged 35–74 years. Baseline assessments (2008–2010) included...
The Breast Cancer Fund: Working Women and Breast Cancer
The State of the Evidence Based on the current evidence, action to reduce workplace exposures linked to breast cancer is imperative. The Breast Cancer Fund has spent nearly 15 years translating the science that links environmental exposures to breast cancer, and advocating for change. In the past several years, it has become increasingly evident that the workplace may be a substantive source of many of these exposures and of the resulting risk for breast cancer. Source: http://www.etui.org/fr/content/download/21116/176339/file/working-women-and-breast-cancer-1.pdf
Occupational exposures and sick leave during pregnancy
Results from a Danish cohort study Objective: This study aimed to investigate associations between work postures, lifting at work, shift work, work hours, and job strain and the risk of sick leave during pregnancy from 10–29 completed pregnancy weeks in a large cohort of Danish pregnant women. Methods: Data from 51 874 pregnancies in the Danish National Birth Cohort collected between 1996–2002 were linked to the Danish Register for Evaluation of Marginalization. Exposure information was based on telephone interviews. Hazard ratios (HR) with 95% confidence intervals (95% CI) were calculated...
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...
Miscarriage Among Flight Attendants
Background: Cosmic radiation and circadian disruption are potential reproductive hazards for flight attendants. Methods: Flight attendants from 3 US airlines in 3 cities were interviewed for pregnancy histories and lifestyle, medical, and occupational covariates. We assessed cosmic radiation and circadian disruption from company records of 2 million individual flights. Using Cox regression models, we compared respondents (1) by levels of flight exposures and (2) to teachers from the same cities, to evaluate whether these exposures were associated with miscarriage. Results: Of 2654 women interviewed...
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...
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...
Cancer du sein : le risque du travail de nuit
L'étude française CECILE de l'INSERM montre que le risque de cancer du sein augmente d'environ 30% chez les femmes ayant travaillé de nuit. Les résultats d’une étude publiée dans l'International Journal of Cancer montrent que le risque de cancer du sein est augmenté chez les femmes ayant travaillé de nuit. Menée par des chercheurs de l’Inserm et baptisée CECILE, cette étude a permis de comparer le parcours professionnel de 1.200 femmes ayant développé un cancer du sein entre 2005...
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...
Gender differences in the effect of weekly working hours on occupational injury risk in the United States working population
Objectives : Long working hours can lead to an accumulation in fatigue that may increase worker's risk of injury. However, it is not known if this association is different for men and women. Our aim was, therefore, to investigate gender differences in the effect of weekly working hours on occupational injury risk. Methods : The US National Health Interview Survey is a clustered, stratified, cross-sectional sample representative of the US population, collected using in-household interviews. We pooled seven years of data (2004–2010) comprising 96 915 employed workers. Annualized injury...
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...
Flexible working time arrangements and gender equality
A recent EU study looks at the incidence of flexible working time arrangements and their implication for gender equality in 30 European countries. It found wide diversity in the length of working time but an overall increase in its incidence. It also looked at flexibility in the organisation of working time, focusing on flexible schedules, working from home and atypical hours. There were some positive links with gender equality but some potentially more negative aspects. Source : http://www.eurofound.europa.eu/ewco/2011/01/EU1101031I.htm
Le travail de nuit des salariés en 2009
Fréquent dans les services publics ; en augmentation dans l'industrie et pour les femmes En 2009, 15,2 % des salariés (21,4 % des hommes et 9 % des femmes), soit 3,5 millions de personnes, travaillent la nuit, habituellement ou occasionnellement. C'est un million de salariés de plus qu'en 1991, l'augmentation étant particulièrement forte pour les femmes. Les trois quarts des salariés qui travaillent la nuit le font dans les services : 31 % dans le secteur public et 42 % dans une entreprise privée de services. Santé, sécurité...
Conditions de travail : les femmes pas tout à fait égales aux hommes
La Cegos publie les résultats d'une enquête réalisée en septembre 2010 auprès de 900 femmes salariées et de 166 directions des ressources humaines. Objectifs : identifier les aspirations des femmes au travail, les difficultés rencontrées, savoir comment les entreprises répondent aux obligations légales en matière d'égalité. Il ressort qu'une femme sur quatre estime avoir e´te´ victime de "discrimination", que la "maternite´" constitue le frein principal a`...
Breast cancer link to shiftwork confirmed
Nearly 2,000 women contract breast cancer every year in the UK because they work night shifts, according to a new report. The figure, published by the Health and Safety Executive (HSE), is based on 2005 data and attributes 1,969 new cases of breast cancer and 555 deaths from the disease that year to shiftwork. It says: 'The estimate of nearly 2,000 breast cancer registrations due to shiftwork in our study is 54 per cent of all female occupationally-related cancer registrations.' Professor Andrew Watterson, head of occupational health research at Stirling University, urged HSE last year...
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