Table 3.

Predictive power of the nomogram compared with the baseline model in the training and validation cohorts

Index	Training cohort			Validation cohort
	Baseline model	Nomogram	P value	Baseline model	Nomogram	P value
AUCa	0.658(0.619–0.698)	0.738(0.701–0.775)	0.004	0.666(0.609–0.724)	0.735(0.682–0.789)	0.036
NRI	Ref	0.228(0.162–0.295)	< 0.001	Ref	0.208(0.108–0.304)	< 0.001
IDI	Ref	0.233(0.220–0.246)	< 0.001	Ref	0.247(0.224–0.271)	< 0.001

AUC area under the receiver operating characteristic curve, IDI integrated discrimination improvement, NRI net reclassification index

^aThe DeLong’s test for statistical significance was used to test differences between AUC curves