Table 4.

Logistic regression models for favorable functional outcome with C-statistics and Akaike information criterion.

Model	C-Statistic (95% CI)	AIC
Model 1—Baseline prognostic factors	0.83 (0.74–0.92)	93.5
Model 2—Baseline prognostic factors + CTA-CS	0.84 (0.75–0.93)	94.2
Model 3—Baseline prognostic factors + CTP-CS	0.86 (0.77–0.94)	90.7

AIC: Akaike Information Criterion; CTA-CS: baseline single phase CTA-based collateral score; CTP-CS: baseline CTP-based collateral score. Higher C-statistic and lower AIC imply better models.