Table 2.

The IDI and NRI were used to assess reclassification performance and improvement in discrimination of our novel prediction model

	IDIa	P Value	NRIb	P value
For derivation cohort
Our model vs APA model	0.138	< 0.001*	0.283	< 0.001*
Our model vs RPA model	0.163	< 0.001*	0.283	< 0.001*
Our model vs GPA model	0.156	< 0.001*	0.388	< 0.001*
For validation cohort
Our model vs APA model	0.139	0.158	0.272	0.178
Our model vs RPA mode	0.235	< 0.001*	0.460	0.020*
Our model vs GPA model	0.108	0.198	0.246	0.099

IDI integrated discrimination improvement index, NRI net reclassification improvement index. *P < 0.05

^a,bPositive velue represents better accuracy, negative velue represents worse accuracy