Table 1. Diagnostic Performance of Obliteration of Normal Heterogeneous Enhancement of Spleen on Arterial-Phase CT Image.

	Observer 1	Observer 2
Az value	0.948 (0.911–0.985)	0.922 (0.818–1.0)
Sensitivity (%)	100 (71.5–100)	90.9 (58.7–99.8)
Specificity (%)	91.2 (84.8–95.5)	93.6 (87.8–97.2)
PPV (%)	50 (28.2–71.8)	55.6 (30.8–78.5)
NPV (%)	100 (96.8–100)	99.2 (95.4–100)

Numbers in parentheses are 95% confidence intervals. Az = the area under the receiver operating characteristic curve, NPV = negative predictive value, PPV = positive predictive value