GSTM1 and gestational diabetes: Regarding GDM-related maternal and delivery complications, the incidence of hypertensive disorders of pregnancy and the need for cesarean delivery increased as Hb level increased (P < 0.01), whereas EGWG, absolute GWG, antenatal BMI, fetus sex, neonatal weight, macrosomia, LGA, and SGA were not significantly affected (Table 1).