Fig. 3

Receiver operating characteristic (ROC) curve of the comprehensive risk score (CRS): (a) and acute physiology and chronic health evaluation (APACHE) II: (b) for predicting postoperative complications in oral and maxillofacial surgery. Approximate optimal cut-off points for predicting complications: CRS 1.01 (sensitivity: 85.7%, specificity: 73.9%, ROC curve area: 0.814) and APACHE II 10.00 (sensitivity: 100.0%, specificity: 47.8%, ROC curve area: 0.795)