Fig. 2
Receiver operating characteristic curve analysis of gestational weight gain predictive of dystocia by BMI category. Probability of weight gain during pregnancy associated with dystocia by BMI category; vertical axis, True Positive rate; horizontal axis: False Positive rate. a Receiver operating characteristic (ROC) curve for G1 (BMI < 18.5 kg/m2), with an area under the curve (AUC) of 0.641 (P = 0.019) and cutoff gestational weight gain of 11.5 kg (sensitivity, 0.500; specificity, 0.659). b ROC for G2 (BMI,18.5 to < 20.0 kg/m2); AUC, 0.634 (P = 0.010); cutoff, 12.3 kg (sensitivity, 0.484; specificity, 0.764). c ROC for G3 (BMI, 20.0 to < 23.0 kg/m2); AUC, 0.677 (P < 0.001); cutoff value, 14.3 kg (sensitivity, 0.391; specificity, 0.883). d ROC for G4 (BMI, 23.0 to < 25.0 kg/m2); AUC, 0.630 (P = 0.031); cutoff, 11.5 kg (sensitivity, 0.545; specificity, 0.621). e ROC for G5 (BMI, 25.0 to < 30.0 kg/m2); AUC, 0.540 (P = 0.446). f ROC for G6 (BMI ≥ 30.0 kg/m2); AUC, 0.567 (P = 0.291)