Interrater agreement and sensitivity and specificity in differentiating near occlusion from moderate stenosis using various criteria and combinations
| Criteria | Interrater Agreement | Sensitivity (%) | Specificity (%) |
|---|---|---|---|
| Delayed time of contrast arrival | 0.46 | 37.5 | 93.8 |
| Direct or indirect evidence of collaterals | 0.71 | 75.0 | 93.8 |
| ICA to ICA comparison of diameter reduction | 0.75 | 75.0 | 90.6 |
| ICA to ECA comparison of diameter reduction | 0.83 | 84.4 | 93.8 |
| One criterion present | 0.76 | 90.6 | 84.4 |
| Two or more criteria present | 0.88 | 90.6 | 93.8 |
| Three or more criteria present | 0.72 | 59.4 | 96.9 |
| Four criteria present | 0.61 | 31.3 | 96.9 |
| ICA to ICA or ICA to ECA comparison of diameter reduction | 0.84 | 90.6 | 90.6 |
| ICA to ICA and ICA to ECA comparison of diameter reduction | 0.78 | 68.8 | 93.8 |
Note.—ICA indicates internal carotid artery; ECA, external carotid artery.