Fig. 4

Assessment and validation of the nomogram. A. ROC curve for the nomogram; B. DeLong's test was used to evaluate the two correlated ROC curves of model (p = 0.132); C. Calculation of the NRI using a cut of 0.05 showing good efficacy; D. Calibration plot of the nomogram. Ideal line represents perfect prediction that nomogram-predicted probability matches actually observed probability; and E. The decision curves showed the nomogram model was clinically useful. (ROC Receiver operating characteristic, AUC Area under the receiver operating characteristic curve, NRI Net reclassification index.)