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Carcinogenicity of night shift work
In June, 2019, a Working Group of 27 scientists from 16 countries met at the International Agency for Research on Cancer (IARC) in Lyon, France, to finalise their evaluation of the carcinogenicity of night shift work. This assessment will be published in volume 124 of the IARC Monographs. In 2007, shift work involving circadian disruption was classified as “probably carcinogenic to humans” (Group 2A), on the basis of sufficient evidence in experimental animals and limited evidence of breast cancer in humans. In this updated evaluation, the Working Group chose the name “night shift...
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...
Healthy working time arrangements for healthcare personnel and patients
A systematic literature review Background: A number of working time arrangements have been linked to negative consequences for both health personnel and their patients. A common hypothesis put forth to explain these findings suggests that certain working time arrangements lead to negative patient consequences due to the adverse impact they have on employee health. The purpose of this study is to use systematic reviews to investigate whether employee health explains the relationship between working time arrangements and patient safety. Methods: A systematic literature review was performed including...
Short time between shifts and risk of injury among Danish hospital workers
A register-based cohort study Objectives: Short time between consecutive work shifts (quick returns, ie, ≤11 hours between shifts) is associated with sleepiness and fatigue, both of which have been linked to risk of injury. This paper aims to study quick returns between work shifts and risk of injury among Danish hospital workers. Method: The study population included 69 200 employees, primarily working at hospitals, corresponding to 167 726 person years at risk between 2008–2015. Information on working hours was obtained from payroll data in the Danish Working Hour Database and linked...
Do Working Hours Affect Health? Evidence from Statutory Workweek Regulations in Germany
This study estimates the causal effect of working hours on health. We deal with the endogeneity of working hours through instrumental variables techniques. In particular, we exploit exogenous variation in working hours from statutory workweek regulations in the German public sector as an instrumental variable. Using panel data, we run two-stage least squares regressions controlling for individual-specific unobserved heterogeneity. We find adverse consequences of increasing working hours on subjective and several objective health measures. The effects are mainly driven by women and parents of minor...
Association of changes in work shifts and shift intensity with change in fatigue and disturbed sleep: a within-subject study
Objectives: The aim of this study was to examine whether changes in work shifts and shift intensity are related to changes in difficulties to fall asleep, fatigue, and sleep length. Methods: Questionnaire responses of hospital employees (N=7727, 93% women) in 2008, 2012, 2014 and 2015 were linked to daily-based records of working hours during three months preceding each survey. We used conditional logistic regression and longitudinal fixed-effects analyses to investigate odds ratios (OR) and 95% confidence intervals (CI) for each 25% within-individual change in the proportion of working hour characteristics...
Risk of injury after evening and night work
Findings from the Danish Working Hour Database Objectives: Evening and night work have been associated with higher risk of injury than day work. However, previous findings may be affected by recall bias and unmeasured confounding from differences between day, evening and night workers. This study investigates whether evening and night work during the past week increases risk of injury when reducing recall bias and unmeasured confounding. Methods: We linked daily working hours at the individual level of 69 200 employees (167 726 person years from 2008–2015), primarily working at hospitals...
949 Shiftwork and breast cancer: epidemiology, burden, and implications for prevention
Introduction: Approximately one in five workers globally work night, evening, or rotating shifts. Shiftwork involving circadian disruption is a probable carcinogen for breast cancer. Our objective was to synthesise the current state of the epidemiological literature, report on shiftwork-associated breast cancer burden in Canada, and discuss implications for prevention. Methods: A search was conducted for meta-analyses accompanied by a systematic review, published from 2010–2017, that included at least one meta-risk estimate (mRE) for breast cancer associated with any permanent/rotating night...
Impacts potentiels du télétravail sur les comportements en transport, la santé et les heures travaillées au Québec
Ce rapport de recherche utilise les données de l'Enquête sociale générale (ESG) de Statistique Canada menée en 2010 afin d'établir une caractérisation statistique des télétravailleurs québécois et d'estimer certains des impacts potentiels du télétravail sur les comportements relatifs aux déplacements, la santé et les heures travaillées. Nous présentons d'abord le contexte ayant mené à la croissance du télétravail, des estimations de la...
Night-shift work and hematological cancers
A population based case-control study in three Nordic countries Objective: The aim of this case–control study was to assess the effect of night-shift work on the risk of hematological cancers. Methods: The study included 39 371 leukemia, 56 713 non-Hodgkin lymphoma, 9322 Hodgkin lymphoma, and 26 188 multiple myeloma cases diagnosed between 1961 and 2005 in Finland, Sweden, and Iceland. Five controls for each case were selected from the Nordic Occupational Cancer Study (NOCCA) cohort, matched by year of birth, sex and country. Night-shift exposure was assessed by using the NOCCA job-exposure...
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...
Comprendre l’influence de la régulation des contraintes temporelles sur l’appropriation des principes généraux de déplacement sécuritaire des bénéficiaires par les recrues préposés aux bénéficiaires
Les préposés aux bénéficiaires (PAB) ont comme mandat de réaliser l'ensemble des activités d'assistance envers les résidents des centres d'hébergement et de soins de longue durée (CHSLD) au Québec. Ils exercent une fonction indispensable dans les CHSLD, alors que le vieillissement de la population s'accentue, que les problématiques physiques et cognitives des résidents s'aggravent et que la réponse à leurs besoins se complexifie. Les PAB forment également une catégorie...
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...
Quelles sont les évolutions récentes des conditions de travail et des risques psychosociaux?
Les premiers résultats de la dernière enquête « Conditions de travail » conduite en 2016 font état d'une stabilisation des contraintes de rythme de travail et d'une baisse de certaines contraintes psychosociales (charge mentale en diminution, horaires moins contraignants, soutien social fort et stabilisation de la demande émotionnelle) qui s'accompagnent d'un recul des comportements hostiles. En revanche l'autonomie des salariés poursuit son recul. Les contraintes physiques sont globalement stabilisées à un niveau...
Shift work and the risk of cardiovascular disease
A systematic review and meta-analysis including dose–response Relationship Objectives: The aim of this review was to assess the risk of cardiovascular disease (CVD) events associated with shift work and determine if there is a dose–response relationship in this association. Method: Electronic databases (PubMed, Scopus, and Web of Science) were searched for cohort or case–control control study designs in any population, reporting exposure to shift work as the main contributing factor to estimate CVD risk. For each study, adjusted relative risk (RR) ratios and 95% confidence intervals...
A review of the impact of shift-work on cancer
Summary of the evidence for practitioners Shift work that involves disruption to the body's circadian rhythm is classified as probably carcinogenic to humans based on limited evidence in humans and sufficient evidence in experimental animals. This article draws together the available information from the epidemiological, mechanistic and health and safety practice research to provide advice for practitioners. There is evidence that the increase in breast cancer risk amongst women who have worked night shifts is relatively modest and we cannot exclude the possibility that there is no cancer risk...
Shiftwork and the Retinal Vasculature Diameters Among Police Officers
Objective: To investigate associations of central retinal arteriolar equivalent (CRAE), a measure of retinal arteriolar width, and central retinal venular equivalents (CRVE), a measure of retinal venular width, with shiftwork in 199 police officers (72.9% men). Methods: Shiftwork (day, afternoon, night) was assessed using electronic payroll records. Four digital retinal images per officer were taken. Mean diameters of the retinal vasculature were compared across shifts using analysis of variance (ANOVA)/analysis of covariance (ANCOVA). Results: Among all officers (mean age = 46.6 ± 6.8 years...
Dimensions sociales et psychologiques associées aux activités minières et impacts sur la qualité de vie
L'intérêt de l'industrie et du gouvernement pour la mise en valeur des ressources minérales du territoire québécois, particulièrement sur le territoire visé par le Plan Nord, convie les acteurs de la santé publique à étudier les activités qui y sont associées et leurs répercussions sanitaires. Afin de répondre au besoin du réseau de la santé publique de mieux comprendre les répercussions sanitaires associées aux activités minières, une revue de littérature...
Night Shift Work and Its Health Effects on Nurses
The purpose of this research was to study night shift work and its health effects on nurses. This was a quantitative study using descriptive design; it also incorporated three qualitative open-ended questions to complement the study. The data were collected using Survey Monkey, with an Internet-based confidential data collection tool. The population of relevance to this study was nurses employed in hospital settings in the United States. E-mail addresses and Facebook were used to recruit participants. Results indicated that there is an increased risk of sleep deprivation, family stressors, and...
Have mobile devices changed working patterns in the 21st century?
A time-diary analysis of work extension in the UK It is commonly claimed that ubiquitous connectivity erodes the boundaries that once separated work from other aspects of life. Mobile devices in particular enable people to perform work-related activities anytime anywhere. Surprisingly, however, we know little about how people nationwide organise their daily working time over a period that has witnessed rapid technological change. Using the United Kingdom Time Use Surveys 2000 and 2015, covering this period of technological change, we studied work extension practices, and the links between work...
Personal light-at-night exposures and components of variability in two common shift work industries
Uses and implications for future research Objectives: Shift workers’ increased risk of various adverse health outcomes has been linked to light-at-night (LAN) exposure, but few studies have measured LAN exposure in workplaces. To inform future research methods, this study aimed to (i) measure shift workers’ exposures to LAN across industries, occupations, and work environments and (ii) assess components of variance across different exposure groupings and metrics. Methods: Between October 2015 and March 2016, 152 personal full-shift measurements were collected from 102 night shift workers...
Working time patterns for sustainable work
Working time is a recurrent topic of study because the nature of work, its content, the conditions under which it is performed and the labour market itself keep changing. This report provides an overview of the recent evolution of working time duration and organisation in the EU and highlights the most important trends and differences between Member States. Through an in-depth analysis of data from the sixth European Working Conditions Survey carried out in 2015, it examines – from a gender and life course perspective – the links between working time patterns, work–life balance...
Night work, long work weeks, and risk of accidental injuries
A register-based study Danish employees with night work had a higher ratio of accidental injuries compared to day workers. Awareness should be raised in order to prevent injuries in the future. No association between weekly working hours and accidental injuries were found. Thus it appears that the current regulation ensures that long weekly working hours does not imply an increased risk of injuries. Source: Larsen, A. D., Hannerz, H., Møller, S. V., Dyreborg, J., Bonde, J. P., Hansen, J., ... & Garde, A. H. (2017). Scandinavian Journal of Work, Environment & Health . http://dx.doi...
Shift work and the incidence of prostate cancer
A 10-year follow-up of a German population-based cohort study Objectives: We investigated the association of shift and night work with the incidence of prostate cancer using data of the population-based prospective Heinz Nixdorf Recall Study from the highly industrialized Ruhr area in Germany. Methods: Participants of the baseline survey were recruited between 2000–2003. A follow-up survey including, a detailed interview on shift and night work, was conducted from 2011–2014. We included 1757 men who did not report a history of prostate cancer at baseline. We assessed shift- and night...
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...
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