Table 2. Diagnostic Performance of Conventional and Modified CT Angiography Criteria for Hepatic Artery Occlusion.

Parameter	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Accuracy (%)
Conventional criterion (anastomosis site abnormalities alone)	100 (91.2, 100.0) [40/40]	74.5 (64.4, 82.9) [70/94]	62.5 [40/64]	100 [70/70]	82.1 (74.5, 88.2) [110/134]
Modified criterion (both anastomosis site and distal run-off abnormalities)	92.5 (79.6, 98.4) [37/40]	93.6 (86.6, 97.6) [88/94]	86.0 [37/43]	96.7 [88/91]	93.3 (87.6, 96.9) [125/134]
p *	0.250	0.001			0.002

Data are presented as percentages with 95% confidence intervals in parentheses and number of patients in brackets. Anastomosis site abnormality was defined as more than 50% stenosis at or around the anastomosis. Distal run-off abnormality means no visible, or irregular, faint, and discontinuous enhancement of post anastomotic hepatic artery. ^*The p values were by comparison between conventional and modified criteria. NPV = negative predictive value, PPV = positive predictive value