Journal
BRITISH JOURNAL OF CANCER
Volume 99, Issue 9, Pages 1502-1505Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.bjc.6604684
Keywords
sleep duration; breast cancer; incidence; Japanese; prospective cohort study
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Funding
- Ministry of Health, Labour and Welfare, Japan [H18-3jigan-ippan-001]
- MEXT, Japan
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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).
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