Contingency table for collateral status compared with volume with rCBF < 38%a
| Volume with rCBF <38%: Collateral Status | <27 mL | ≥27 mL | Total |
|---|---|---|---|
| Good collateral status (score 4−5) | 89 | 22 | 111 |
| Poor collateral status (score 0–3) | 26 | 77 | 103 |
| Total | 115 | 99 | 214 |
↵a Good collateral status was significantly associated with a smaller rCBF < 38% lesion size (Fisher exact test was significant with P < .001).