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. Author manuscript; available in PMC: 2018 Apr 3.
Published in final edited form as: Am J Obstet Gynecol. 2014 Jan;210(1):3–11. doi: 10.1016/j.ajog.2013.11.020

Figure 1. Mortality hazard ratios according to sleep duration for men and women.

Figure 1

Data collected from 636,095 men and 480,841 women in the Cancer Prevention Study II (1982-1988). Both men and women with usual sleep duration of 7 hours had the best survival. Participants reporting sleep durations ≤ 6 hours and ≥ 8 hours had significantly increased mortality hazard.7 Reproduced, with permission, from Luyster et al.11