TABLE 2:

Detection of collateral pathways (n = 150) in 50 healthy subjects

Number of findings
Detection with MR Angiography^*	Detection with TCCD^*		Total
Detection with MR Angiography^*	Yes	No	Total
Observer 1
Yes	105	5	110
No	18	22	40
Total	123	27	150
Observer 2
Yes	107	9	116
No	16	18	34
Total	123	27	150

Diagnostic discrimination
Measure	Observer 1^†	Observer 2^†
Sensitivity, %	85 (79, 92)	87 (81, 93)
Specificity, %	81 (62, 94)	67 (46, 84)
Positive predictive value, %	95 (90, 99)	92 (86, 96)
Negative predictive value, %	55 (39, 71)	53 (35, 70)

* Yes indicates functional. No indicates nonfunctional.
† Numbers in parentheses are the 95% confidence intervals.