Collaterals on ASL (presence of ATA) versus DSA-confirmed collaterals—atherosclerosis
| DSA | |||
|---|---|---|---|
| Yes | No | ||
| ASL | Yes | 24 | 130 |
| No | 9 | 44 | |
| P = .811 (χ2) | |||
| Sensitivity, 72.7% (65.1%–80.3%) | |||
| Specificity, 25.3% (17.9%–32.7%) | |||
| PPV, 15.6% (9.4%–21.8%) | |||
| NPV, 83.0% (76.6%–89.4%) | |||
Note:—PPV indicates positive predictive value; NPV, negative predictive value.