GSTM1 and gestational diabetes: Using Hb as a linear variable, crude Hb had 70.0% sensitivity and 42.0% specificity (ROC AUC 0.591, 95% CI [0.565; 0.617]) on prediction of GDM while Model 2 had the highest sensitivity (70.7%) and specificity (70.7%) (ROC AUC 0.768, 95% CI [0.746; 0.789]) (Fig. 2a, Table S4).