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

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

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).

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Breast Neoplasms / etiology*
  • Cohort Studies
  • Female
  • Humans
  • Melatonin / physiology
  • Middle Aged
  • Proportional Hazards Models
  • Prospective Studies
  • Risk
  • Sleep*
  • Time Factors

Substances

  • Melatonin