Figure 2.

Associations of gestational diabetes mellitus and maternal age with the risk of cesarean delivery. (a) Percentage of gestational diabetes mellitus by maternal age groups. Values are n (%). (b) Adjusted odds ratios for cesarean delivery according to different gestational diabetes mellitus and maternal age groups. Values are odds ratios. Adjusted for maternal age, education, employment, annual household income, study centers, drinking during pregnancy, passive smoking during pregnancy, prepregnancy body mass index categories, parity, use of assisted reproductive technology, folic acid supplementation, gestational age at delivery, and gestational weight gain categories. Abbreviations: GDM: gestational diabetes mellitus.