Sleep duration and the risk of prostate cancer: the Ohsaki Cohort Study.
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 >or=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).
Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan. m-kaki@umin.ac.jp
M
M
Kakizaki
K
K
Inoue
S
S
Kuriyama
T
T
Sone
K
K
Matsuda-Ohmori
N
N
Nakaya
S
S
Fukudo
I
I
Tsuji
D000368:Aged; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011471:Prostatic Neoplasms / Q000453:epidemiology* / Q000209:etiology; D012307:Risk Factors; D012890:Sleep; D013997:Time Factors