Table 3.

ROC curve analyses of diagnostic performance of combinations of various variables.

Characteristics	AUC	95% CI	Sensitivity	Specificity	Youden index	p value
Clin	0.879	(0.825, 0.933)	0.865	0.744	0.610	＜0.001
Clin + Conven MRI	0.901	(0.851, 0.950)	0.788	0.833	0.625	＜0.001
Clin + Conven MRI + NERF	0.924	(0.881, 0.967)	0.788	0.889	0.677	＜0.001

ROC, receiver operating characteristic; AUC, area under ROC curve; Clin = age + histological grade; Conven MRI = nonenhanced T2/FLAIR hyperintensity lesions + enhancement of residual cavity wall; NERF, new enhancement beyond the radiation field.