Fig. 2. ROC curves comparing the power of the non-invasive model (model 1, solid line), and the addition (model 2, dotted line) of amniotic fluid tests results as invasive markers to the non-invasive model for predicting subsequent histologic chorioamnionitis [model 1: area under the curve (AUC), 0.742; 95% confidence interval (CI), 0.661–0.823 vs. model 2: AUC, 0.757; 95% CI, 0.677–0.836; p=0.623). ROC, receiver operating characteristic.