Table 5. Comparison of the AUCs of the λHU, n△HU, and nIWR in the arterial and venous phases.

	Arterial phase				Venous phase
	λHU VS n△HU	λHU VS nIWR	n△HU VS nIWR		λHU VS n△HU	λHU VS nIWR	n△HU VS nIWR
Difference of AUC	0.14	0.18	0.04		0.08	0.08	0.16
Standard error	0.05	0.05	0.04		0.05	0.05	0.05
95% confidence interval	0.04–0.23	0.08–0.27	−0.03–0.15		−0.02–0.18	−0.01–0.17	0.06–0.26
Z value	2.85	3.65	1.08		1.63	1.72	3.09
P value	<0.01	<0.01	0.28		0.1	0.09	<0.01

λ_HU, dual-energy curve slope value; n△HU, standardized iodine concentration; nIWR, iodine water ratio; AUC, area under the curve.