Table 3:

Threshold analysis

HU Value	Basal Values				After Contrast Medium Values
HU Value	Sensitivity	Specificity	+LR	−LR	Sensitivity	Specificity	+LR	−LR
<0	0.00	100.00	NC	1.00	0.00	100.00	NC	1.00
≤2	55.93	96.36	15.38	0.46	35.59	100.00	NC	0.64
≤4	67.80	93.64	10.65	0.34	45.76	99.09	50.34	0.55
≤8	69.49	90.00	6.95	0.34	67.80	99.09	74.58	0.32
≤12	71.19	90.00	7.12	0.32	67.80	96.36	18.64	0.33
≤16	77.97	86.36	5.72	0.26	74.58	95.45	16.41	0.27
≤20	84.75	84.55	5.48	0.18	76.27	95.45	16.78	0.25
≤22	88.14	83.64	5.39	0.14	81.36	93.64	12.78	0.20
≤25	94.92	83.64	5.80	0.061	93.22	92.73	12.82	0.073
≤30	100.00	80.91	5.24	0.00	100.00	92.73	13.75	0.00
≤120	100.00	0.00	1.00	NC	100.00	0.00	1.00	NC

Note:—+LR indicates positive likelihood ratio; −LR, negative likelihood ratio; NC, not classifiable.