Table 4.

The diagnosis performance indices of iliac spectral CT parameters

Iliac parameters	Ratio of signal intensity	Ratio of water concentration	Ratio of calcium concentration	CT value
AUC	0.705	0.740	0.892	0.760
Cut-off value	2.72	1.05	27.73	378.81
Sensitivity, %	34.2	69.7	65.8	65.8
Specificity, %	98	69.4	95.9	83.7
Positive likelihood ratio	17.1	2.28	16.05	4.04
Negative likelihood ratio	0.67	0.44	0.36	0.41
Diagnostic odds ratio	25.52	5.18	44.58	9.85

AUC, areas under the curve.