Table 4. Parameters of ROC curves.

Parameters	AUC	Optimal threshold	Standard error	95% CI
				Upper bound	Lower bound
Wall thickness	0.734	1.53	0.053	0.838	0.630
Attenuation value of the middle or outer layer in unenhanced phase	0.765	28.5	0.048	0.859	0.671
ΔCT of the middle or outer layer in arterial phase	0.774	11.5	0.048	0.868	0.679
ΔCT of the middle or outer layer in portal venous phase	0.774	19.5	0.048	0.869	0.679
ΔCT of the middle or outer layer in equilibrium phase	0.724	28.5	0.071	0.863	0.585

ROC: receiver operating characteristic curve

AUC: area under the curve

CI: confidence interval