Fig. 4

Receiver operating characteristic curves and calibration curves of the nomogram. Notes: Figure a, b, and c indicate the AUCs of the nomogram, with sensitivities and specificities, and d and e and f denote the calibration curves in the training set, internal validation set and external test set, respectively. The horizontal axis of figure d, e, and f show the predicted probability of IFD deterioration and the vertical axis show the actual probability. The predictive performance of the nomogram (black line) closer to the ideal prediction line (dotted line) represents a higher predictive accuracy. AUC, area under the receiver operating characteristic curve