Table 3.
Predictive accuracy of different parameters of cerebral blood flow velocity in the internal carotid artery, middle cerebral artery, and vertebral artery
| Parameter | Area under the curve (AUC) | Cut-off | Sensitivity | Specificity | Positive predictive value | Negative predictive value | Diagnostic accuracy (%) | Likelihood ratio (LR)+ | LR_ |
|---|---|---|---|---|---|---|---|---|---|
| PSV ICA | 0.967 | ≥39.5 | 98.1 | 68.1 | 70.7 | 97.9 | 81.30 | 3.07 | 0.44 |
| EDV ICA | 0.988 | ≥8.52 | 100 | 65.2 | 69.2 | 100 | 88.48 | 2.873 | -0.533 |
| RI ICA | 0.945 | ≤0.73 | 94.4 | 87 | 85 | 95.2 | 90.4 | 7.261 | -0.085 |
| PI ICA | 0.998 | ≤1.25 | 100 | 95.7 | 94.7 | 100 | 97.5 | 23.25 | -0.04 |
| PSV MCA | 0.994 | ≥31.4 | 100 | 91.3 | 90 | 100 | 95.12 | 11.49 | -0.095 |
| EDV MCA | 0.982 | ≥7.64 | 98.1 | 88.4 | 86.9 | 98.4 | 92.6 | 8.456 | -0.109 |
| RI MCA | 0.936 | ≤0.76 | 92.6 | 65.2 | 67.6 | 91.8 | 77.23 | 2.66 | -0.420 |
| PI MCA | 0.995 | ≤1.15 | 98.1 | 98.6 | 98.1 | 98.6 | 98.37 | 70.071 | 0.005 |
| PSV VA | 0.999 | ≥29 | 100 | 98.6 | 98.2 | 100 | 99.18 | 71.42 | 0 |
| EDV VA | 0.969 | ≥4.36 | 96.3 | 72.5 | 73.2 | 96.2 | 82.92 | 3.501 | -0.328 |
| RI VA | 0.802 | ≤0.80 | 81.5 | 66.7 | 65.7 | 82.1 | 73.17 | 2.44 | -0.221 |
| PI VA | 1.000 | ≤1.22 | 100 | 100 | 100 | 100 | 100 | 0 |