Journal
BRITISH JOURNAL OF CANCER
Volume 99, Issue 1, Pages 176-178Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.bjc.6604425
Keywords
sleep duration; prostate cancer; incidence; Japanese; prospective cohort study
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In a prospective study of prostate cancer incidence (127 cases), among 22 320 Japanese men, sleep duration was associated with lower risk; the multivariate hazard ratio of men who slept >= 9 h per day compared with those who slept less was 0.48 (95% confidence interval: 0.29-0.79, P for trend = 0.02).
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