• Am J Prev Med · Mar 2015

    Total and cause-specific mortality of U.S. nurses working rotating night shifts.

    • Fangyi Gu, Jiali Han, Francine Laden, An Pan, Neil E Caporaso, Meir J Stampfer, Ichiro Kawachi, Kathryn M Rexrode, Walter C Willett, Susan E Hankinson, Frank E Speizer, and Eva S Schernhammer.
    • Division of Cancer Epidemiology & Genetics, Genetic Epidemiology Branch, National Cancer Institute, Bethesda, Maryland.
    • Am J Prev Med. 2015 Mar 1; 48 (3): 241252241-52.

    BackgroundRotating night shift work imposes circadian strain and is linked to the risk of several chronic diseases.PurposeTo examine associations between rotating night shift work and all-cause; cardiovascular disease (CVD); and cancer mortality in a prospective cohort study of 74,862 registered U.S. nurses from the Nurses' Health Study.MethodsLifetime rotating night shift work (defined as ≥3 nights/month) information was collected in 1988. During 22 years (1988-2010) of follow-up, 14,181 deaths were documented, including 3,062 CVD and 5,413 cancer deaths. Cox proportional hazards models estimated multivariable-adjusted hazard ratios (HRs) and 95% CIs.ResultsAll-cause and CVD mortality were significantly increased among women with ≥5 years of rotating night shift work, compared to women who never worked night shifts. Specifically, for women with 6-14 and ≥15 years of rotating night shift work, the HRs were 1.11 (95% CI=1.06, 1.17) and 1.11 (95% CI=1.05, 1.18) for all-cause mortality and 1.19 (95% CI=1.07, 1.33) and 1.23 (95% CI=1.09, 1.38) for CVD mortality. There was no significant association between rotating night shift work and all-cancer mortality (HR≥15years=1.08, 95% CI=0.98, 1.19) or mortality of any individual cancer, with the exception of lung cancer (HR≥15years=1.25, 95% CI=1.04, 1.51).ConclusionsWomen working rotating night shifts for ≥5 years have a modest increase in all-cause and CVD mortality; those working ≥15 years of rotating night shift work have a modest increase in lung cancer mortality. These results add to prior evidence of a potentially detrimental effect of rotating night shift work on health and longevity.Copyright © 2015 American Journal of Preventive Medicine. All rights reserved.

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