Outdoor light at night was linked to a higher risk of breast cancer in a study published in the International Journal of Cancer.
For the study, investigators analyzed residential outdoor light at night estimated from satellite imagery in 1996 and assessed rates of breast cancer over 16 years of follow-up in 186,981 postmenopausal women.
Compared with the lowest level of exposure to outdoor light at night, the highest exposure was associated with a 10% higher risk of developing breast cancer during follow-up, after controlling for confounding factors.
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