Validity statistics for the paired permutations of near occlusion single-variable test models (in order of decreasing accuracy)
| Sensitivity | Specificity | PPV | NPV | |
|---|---|---|---|---|
| dlCA + dlCA:dlCA* (n = 235) | 91.9 | 96.0 | 81.0 | 98.4 |
| dlCA:dlCA* + dlCA:ECA (n = 234) | 89.2 | 95.4 | 78.6 | 97.9 |
| dlCA + dlCA:ECA (n = 239) | 88.1 | 95.4 | 80.4 | 97.4 |
| ICA + dlCA (n = 231) | 87.8 | 96.8 | 85.7 | 97.4 |
| ICA + dlCA:dlCA* (n = 225) | 86.8 | 96.3 | 82.5 | 97.3 |
| ICA + dICA:ECA (n = 229) | 82.9 | 96.8 | 85.0 | 96.3 |
Note:—dlCA:dlCA*, ratio of the distal internal carotid artery (ICA) diameter to that of the contralateral distal ICA; dlCA, diameter of the distal ICA; dlCA:ECA, ratio of the distal ICA diameter to the distal external carotid artery diameter; ICA, narrowest diameter of the ICA bulb stenosis. All diameters are expressed in millimeters. PPV indicates positive predictive value; NPV, negative predictive value. Values were obtained from contingency tables created to evaluate paired permutations of the single-variable test models. Positive and negative predictive values were calculated for all data. Population size (n) is reported for each permutation.