Table 4.
Receiver operating characteristics curves of collateral-related parameters for evaluating clinical outcome.
| Variables | AUC (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) | Youden index | Associated criterion | P |
|---|---|---|---|---|---|---|
| tMIP CTA VCCq | 0.93(0.85,1.00) | 0.88(0.56,0.94) | 0.80(0.39,1.00) | 0.68 | −0.84 | <0.001 |
| sCTA VCCq | 0.74(0.63,0.85) | 0.71(0.38,0.94) | 0.66(0.39,0.86) | 0.47 | 0.03 | <0.001 |
| Tan score on sCTA | 0.56(0.43,0.70) | 0.74(0.28,0.99) | 0.73(0.19,0.99) | 0.47 | 2.50 | 0.307 |
| Tan score on tMIP CTA | 0.79(0.68,0.89) | 0.50(0.07,0.90) | 0.98(0.30,1.00) | 0.48 | −1.00 | <0.001 |
| IP volume | 0.52(0.39,0.65) | 0.50(0.23,0.79) | 0.49(0.27,0.75) | 0.00 | 248.96 | 0.727 |
| IC volume | 0.71(0.58,0.83) | 0.65(0.47,0.77) | 0.60(0.25,0.94) | 0.25 | 52.69 | 0.002 |
| Mismatch ratio | 0.70(0.57,0.82) | 0.71(0.44,0.82) | 0.61(0.26,0.90) | 0.32 | 9.05 | 0.002 |
AUC, area under the curve; CI, confidence interval; tMIP CTA, time maximum intensity projection computed tomography angiography; sCTA, single-phase computed tomography angiography; tMIP CTA VCCq, quantitative measurement of vascular volume ratio on tMIP CTA; sCTA VCCq, quantitative measurement of vascular volume ratio on sCTA.