Table 1:

Comparison of different types of atherosclerotic plaques between VH-IVUS and histologic sections (as reference standard)

Category of Plaque	Plaque Classification by Histological Analysis	Plaque Classification by VH-IVUS Analysis
		True-Positive	True-Negative	False-Positive	False-Negative	Sensitivity	Specificity	PPV	NPV
No plaque	2	2	32	0	0	100	100	100	100
Pathologic intima thickening	6	3	28	0	3	50	100	100	90.3
Fibroatheroma	19	15	11	4	4	78.9	73.3	78.9	73.3
Calcified fibroatheromaa	0	0	33	1	0	0	97	0	100
Thin-cap fibroatheroma	3	2	30	1	1	66.6	96.7	66.6	96.7
Calcified thin-cap fibroatheroma	2	1	31	1	1	50	96.8	50	96.8
Fibrocalcific atheroma	2	2	32	0	0	100	100	100	100
Total	34	25	197	7	9	73.5	96.6	78.1	95.6

PPV indicates positive predictive value; NPV, negative predictive value.

^aNumber is small and requires cautious interpretation of false-positive or false-negative values.