Fig. 4

AUC and calibration curves of the models. A, B AUC of the model10 and model11 to predict probability of PLOS in PACU in the development and validation sets. The black line (model11) represents AUC = 0.776. which is considered ideal. The red line (model10, based on which the nomogram was established) represents AUC = 0.773. AUC (model10) vs AUC (model11), p > 0.05. C, D Calibration curves of the nomogram for PLOS in the development and validation sets. The black dots calculated with nomogram are evenly distributed around the grey bold lines, showing perfect consistency. AUC, area under the receiver operating characteristic curve; DEV, development; ROC, receiver operating characteristic curve; PLOS, prolonged length of stay; VAD, validation