Figure 2.

The effect size (ES) and 95% confidence interval (CI) of the association between light at night exposure and breast cancer risk for both indoor and outdoor exposure of n = 19 [25,26,27,28,29,32,33,34,35,41,43,44,47,48,50] studies, with n = 4 [30,31,42,45] assessing both. The solid diamond represents the estimated risk ratio of the highest exposure group, and the solid line represents the 95% CI. The dark grey square represents the study weight. The empty diamond represents the pooled risk ratio for each exposure group.