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Br J Cancer. 2008 Nov 4;99(9):1502-5. doi: 10.1038/sj.bjc.6604684. Epub 2008 Sep 23.

Sleep duration and the risk of breast cancer: the Ohsaki Cohort Study.

Author information

1
Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan.

Abstract

In a prospective study of 23 995 Japanese women, short sleep duration was associated with higher risk of breast cancer (143 cases), compared with women who slept 7 h per day, the multivariate hazard ratio of those who slept </=6 h per day was 1.62 (95% confidence interval: 1.05-2.50; P for trend=0.03).

PMID:
18813313
PMCID:
PMC2579702
DOI:
10.1038/sj.bjc.6604684
[Indexed for MEDLINE]
Free PMC Article

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