Table 3.

Parameters of ROC curves in GTV, CTV, and GTV+CTV model.

	GTV model	CTV model	GTV+CTV model
Training group
Sensitivity	0.673	0.650	0.783
Specificity	0.912	0.940	0.838
Youden index	0.585	0.590	0.621
AUC (95%CI)	0.845 (0.801–0.888)	0.834 (0.787–0.834)	0.869 (0.842–0.896)
Validation group
Sensitivity	0.731	0.885	0.902
Specificity	0.848	0.636	0.814
Youden index	0.579	0.521	0.716
AUC  (95%CI)	0.821 (0.749–0.894)	0.812 (0.780–0.912)	0.906 (0.870–0.942)