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Risk of breast cancer for women with a family history in first-degree relatives. θi (i = 1…38) is the study-specific effect size of the association on the log scale, θ is the pooled effect size of the association on the log scale, test of θi = θj is to test whether the effect sizes are homogenous across the studies, and test of θ = 0 is to test whether the pooled effect size equals to 0
