Linear regression analysis of BMI on local European ancestry at the three admixture peaks.

Reg. Coef., regression coefficient: the change in Z score for each additional copy of the European ancestry allele; CI, confidence interval. In both-sex-combined analysis, BMI was adjusted for age, age-squared, sex and study, and then normal-quantile transformed. Sex-stratified analysis was performed in each gender group and thus not adjusted for sex. aBy Z test for difference between the two the regression coefficients.