Table 3:

Aneurysm detection with cerebral CTA according to aneurysm location^a

Location	Results (No.)				Statistical Analysis (%)
	TP	TN	FP	FN	Sensitivity	Specificity	PPV	NPV	Accuracy
Anterior circulation
Group A	50	39	1	8	86.2 (77.6–94.8)	97.5 (92.5–100.0)	98.0 (94.1–100.0)	83.0 (70.2–93.6)	90.8 (84.7–95.9)
Group B	28	42	2	2	93.3 (83.3–100.0)	95.5 (88.5–100.0)	93.3 (83.3–100.0)	95.5 (88.6–100.0)	94.6 (89.2–98.6)
Posterior circulation
Group A	27	39	2	2	93.1 (82.8–100.0)	95.1 (87.8–100.0)	93.1 (82.8–100.0)	95.1 (87.8–100.0)	94.3 (88.6–98.6)
Group B	38	42	1	2	95.0 (87.5–100.0)	97.7 (93.0–100.0)	97.4 (92.3–100.0)	95.5 (88.6–100.0)	96.4 (91.6–100.0)

Note:—TP indicates true positive; TN, true negative; FP, false positive; FN, false negative.

^aThe data in parentheses are 95% confidence intervals.