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:**â€”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.