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Meta‐analysis of the association between waist circumference (mean differences) and gestational diabetes mellitus. *Data restricted to women with a body mass index ≥ 30 kg/m2. **Data restricted to women with a body mass index ≥ 25 kg/m2. Dakshnamurthy et al. 48 excluded women with obesity (for control). CI, confidence interval; MD, mean difference in cm; RE, random effect
