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, Eva S. Schernhammer

Research output: Contribution to journalArticle

71 Scopus citations

Abstract

Background Rotating night shift work imposes circadian strain and is linked to the risk of several chronic diseases. Purpose To 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. Methods Lifetime 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. Results All-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). Conclusions Women 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.

Original languageEnglish (US)
Pages (from-to)241-252
Number of pages12
JournalAmerican journal of preventive medicine
Volume48
Issue number3
DOIs
StatePublished - Mar 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Epidemiology
  • Public Health, Environmental and Occupational Health

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    Gu, F., Han, J., Laden, F., Pan, A., Caporaso, N. E., Stampfer, M. J., Kawachi, I., Rexrode, K. M., Willett, W. C., Hankinson, S. E., Speizer, F. E., & Schernhammer, E. S. (2015). Total and cause-specific mortality of U.S. nurses working rotating night shifts. American journal of preventive medicine, 48(3), 241-252. https://doi.org/10.1016/j.amepre.2014.10.018