Sleep Duration and Breast Cancer Risk

Sample size: 23995 publication Evidence: moderate

Author Information

Author(s): Kakizaki M, Kuriyama S, Sone T, Ohmori-Matsuda K, Hozawa A, Nakaya N, Fukudo S, Tsuji I

Primary Institution: Tohoku University Graduate School of Medicine

Is short sleep duration associated with a higher risk of breast cancer in Japanese women?

Short sleep duration is linked to a higher risk of breast cancer in Japanese women.

Participants who slept 6 hours or less had a hazard ratio of 1.62 for breast cancer.
The study included 23,995 women and identified 143 cases of breast cancer.
Short sleep duration was categorized into four groups for analysis.

If you don't sleep enough, you might have a higher chance of getting breast cancer.

This was a prospective cohort study that followed 23,995 Japanese women and assessed their sleep duration and breast cancer incidence.

Potential bias due to reliance on self-reported data and lack of information on sleep disorders.

The study relied on self-reported sleep duration and did not account for sleep quality or other factors that could influence sleep.

Participants were Japanese women aged 40-79 years.

0.03

1.05–2.50

p<0.05

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