TABLE 3.

Diagnosis of RAS: Abnormal Change in Parenchymal MTT Post-Captopril vs. Angiographic Standard

Criterion	ΔMTT* (min)
Criterion	0.85†	1.49‡	1.73§
True-positive (no.)	9	5	4
False-positive (no.)	5	4	4
True-negative (no.)	36	37	37
False-negative (no.)	24	28	29
Sensitivity (%)	27	15	12
Specificity (%)	88	90	90
Accuracy (%)	61	57	55

↵* Change in MTT (post-captopril − pre-captopril).
↵† At <50% confidence level.
↵‡ At 90% confidence level.
↵§ At 95% confidence level.