TABLE 5:

Accuracy of Multi-Section CT Angiography on a per-Aneurysm Basis

Size (mm)	Sensitivity	Specificity	PPV	NPV	Accuracy
<4	0.84(26/31)	0.75(15/20)	0.84	0.75	0.80
	0.72, 0.92	0.56, 0.88	0.72, 0.92	0.56, 0.88	0.69, 0.91
4–10	0.97(58/60)	0.83(15/18)	0.95	0.88	0.94
	(0.91, 0.99)	0.64, 0.92	0.90, 0.98	0.68, 0.97	0.88, 0.99
>10	1.00(22/22)	1.00(15/15)	1.00	1.00	1.00
	(0.88, 1.00)	0.83, 1.00	0.88, 1.00	0.83, 1.00	0.84, 1.00

Note.—PPV indicates positive predictive value; NPV, negative predictive value. Numbers in parenthesis indicate numbers of aneurysms, and numbers on second line indicate 95% confidence intervals.