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Circle of Willis anatomy and the balloon test occlusion outcome
| COW anatomy | BTO-positive (%) | BTO-negative (%) | Total (%) | |
| Poorly- | Type 0 | 2 (5) | 0 (0) | 2 (5) |
| developed | Type 1 | 3 (7) | 3 (7) | 6 (14) |
| Well- | Type 2 | 0 (0) | 4 (10) | 4 (10) |
| developed | Type 3 | 0 (0) | 30 (71) | 30 (71) |
| Total | 5 (12) | 37 (88) | 42 (100) | |
Significant differences (P < 0.0001; 95%CI: 0.31-3.21) was seen between the COW anatomy and the BTO outcome. COW: Circle of Willis; BTO: Balloon test occlusion.
