Figure S1. Assessment of publication bias for the standard meta‐analysis. (A‐C) Funnel plot for the efficacy of metformin with placebo on the change in body mass index (BMI) (A), weight (B), waist circumference (C) after 24 weeks' therapy. (D and E) Funnel plot for the efficacy of metformin with placebo on the change in or waist‐to‐hip ratio (WHR) based on all included studies (D) or only 24‐week studies (E). Figure S2. Inconsistency detection of network meta‐analysis.