3.6. Evaluation of the nomogram prediction model
The prediction model was evaluated by plotting a receiver operating characteristic curve and calculating the AUC values. The AUCs of the training and validation sets were 0.863 and 0.899, respectively, suggesting good predictive ability (Fig. Receiver operating characteristic curve of the training and validation sets.The nomogram prediction model was validated using the validation set. The results showed a C-index of 0.899 (95% CI: 0.830–0.968, Calibration curve of the (A) modeling group and (B) prediction group.