. 2023 Nov 2;9(11):e21905. doi: 10.1016/j.heliyon.2023.e21905

Table 4.

Validation of the nomogram.

		Training sample (n = 3068)	Validation sample (n = 2192)
Discrimination	AUC	0.723	0.700
Discrimination	P-value^a	0.522
Calibration	P-value of unreliability index	0.989	0.413
	E aver	0.002	0.006
	E max	0.018	0.023

For AUC comparison. AUC, area under the ROC curve; E, difference in predicted probability and observed frequencies; E aver, average error. Emax, maximal error.