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| Characteristics of collateral | Group 1 (n=46) | Group 2 (n=95) | P value |
|---|---|---|---|
| Type of collateral | 0.331 | ||
| Type 0 | 26 | 48 | |
| Type 1 | 7 | 18 | |
| Type 2 | 9 | 14 | |
| Type 3 | 2 | 5 | |
| Type 4 | 2 | 10 | |
| Scale of collateral | 0.137 | ||
| Scale 0 | 26 | 48 | |
| Scale 1 | 4 | 5 | |
| Scale 2 | 5 | 11 | |
| Scale 3 | 6 | 11 | |
| Scale 4 | 5 | 20 |
Values in the table are number. DSA, digital subtraction angiography.
