Short Communication
British Journal of Cancer (2008) 99, 176–178. doi:10.1038/sj.bjc.6604425 www.bjcancer.com
Published online 10 June 2008
Sleep duration and the risk of prostate cancer: the Ohsaki Cohort Study
M Kakizaki1,2, K Inoue1, S Kuriyama1, T Sone1, K Matsuda-Ohmori1, N Nakaya1, S Fukudo2 and I Tsuji1
- 1Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- 2Division of Behavioral Medicine, Department of Functional Medical Science, Tohoku University Graduate School of Medicine, Sendai, Japan
Correspondence: M Kakizaki, Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan. E-mail: m-kaki@umin.ac.jp
Received 16 March 2008; Revised 18 April 2008; Accepted 24 April 2008; Published online 10 June 2008.
Abstract
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).
Keywords:
sleep duration, prostate cancer, incidence, Japanese, prospective cohort study
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