Table 3.

Diagnostic efficacy of four models in the discrimination between low-risk and high-risk GISTs in both training and validation sets.

	Model 4				Model 1				Model 2				Model 3
	Training set		Validation set		Training set		Validation set		Training set		Validation set		Training set		Validation set
	Low N = 85	High N = 77	Low N = 34	High N = 35	Low N = 83	High N = 79	Low N = 39	High N = 30	Low N = 96	High N = 66	Low N = 40	High N = 29	Low N = 91	High N = 71	Low N = 32	High N = 37
Accuracy	88.3		88.4		85.8		84.1		86.4		82.6		84.6		82.6
Sensitivity	85.4		88.6		84.2		77.1		76.8		74.3		78.0		85.7
Specificity	91.2		88.2		87.5		91.2		96.2		91.2		91.2		79.4
AUC	0.925		0.897		0.894		0.866		0.909		0.892		0.914		0.892

AUC, area under the receiver operating characteristic curve; Model 4, Clinic + CTU + CTA + CTV; Model 1, Clinic + CTU; Model 2, Clinic + CTA; Model 3, Clinic + CTV; CTU, CT value of unenhanced; CTA, CT value of arterial phase; CTV, CT value of venous phase.