Long-Term Sleep Duration as a Risk Factor for Breast Cancer: Evidence from a Systematic Review and Dose-Response Meta-Analysis.

Biomed Res Int · 2017 · PMC5654282 · PMID 29130041

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a positive trendno p-value reported

In the US case-control study, a positive trend for breast cancer was found for every additional sleep hour (OR = 1.06, 95% CI = 1.01~1.11) [ 13 ], and another study observed a positive association between sleep duration and breast cancer incidence with a RR of 1.58 (95% CI = 1.18~2.12) for 9 h or more compared to the reference hours (6.1 h to 8.9 h) [ 11 ].

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