Fig. 2

Comparison of the prevalence of GDM among different weight gain categories. Weight gain was evaluated according to the IOM guidelines based on the Chinese BMI categories. It recommended the optimal rate of weight gain at the second trimester was 0.44–0.58, 0.35–0.50, 0.23–0.33, and 0.17–0.27 kg/week in the underweight, normal weight, overweight, and obese groups, respectively. *Abbreviation: GDM, gestational diabetes mellitus; BMI, body mass index