Preoperative prediction of perineural invasion of rectal cancer based on a magnetic resonance imaging radiomics model: A dual-center study

Table 5 Performance of various radiomics predictive models in the training group as evaluated using the Delong test, integrated discrimination improvement index and net reclassification improvement index

Radiomics prediction models	AUC (95%CI)	Delong test P value	IDI (95%CI)	IDI index P value	NRI (95%CI)	NRI index P value
T2WI + T1CE	0.839 (0.757-0.921)
T2WI	0.817 (0.733-0.901)	0.252	0.081 (0.031-0.131)	0.001	0.510 (0.104-0.865)	0.008
T1CE	0.798 (0.707-0.890)	0.196	0.127 (0.064-0.190)	0.000	0.536 (0.255-1.018)	0.005

AUC: Area under receiver operating characteristic curve; IDI: Integrated discrimination improvement; NRI: Net reclassification improvement; T2WI: T2-weighted imaging; T1CE: Contrast-enhanced T1WI.