Radiologic profiles of 220 hemispheres
| Characteristics | Initial DSA | Second DSA | Z or χ2 | P value |
| Suzuki stage, no (%) | −2.060 | 0.039 | ||
| 0 | 21 (9.5) | 19 (8.6) | ||
| 1 | 13 (5.9) | 13 (5.9) | ||
| 2 | 48 (21.8) | 48 (21.8) | ||
| 3 | 65 (29.5) | 63 (28.6) | ||
| 4 | 45 (20.5) | 48 (21.8) | ||
| 5 | 17 (7.7) | 18 (8.2) | ||
| 6 | 11 (5.0) | 11 (5.0) | ||
| Collateral circulation, no (%) | ||||
| PCA-ACA | −1.000 | 0.317 | ||
| 0 point | 48 (21.8) | 48 (21.8) | ||
| 1 point | 43 (19.5) | 42 (19.1) | ||
| 2 points | 129 (58.6) | 130 (59.1) | ||
| PCA-MCA | −1.633 | 0.854 | ||
| 0 point | 42 (19.1) | 41 (18.6) | ||
| 1 point | 40 (18.2) | 39 (17.7) | ||
| 2 points | 45 (20.5) | 45 (20.5) | ||
| 3 points | 68 (30.9) | 70 (31.8) | ||
| 4 points | 25 (11.4) | 25 (11.4) | ||
| Aneurysm, no (%) | 8 (3.6) | 6 (2.7) | 0.394 | 0.530 |
ACA, anterior cerebral artery; DSA, digital subtraction angiography; MCA, middle cerebral artery; PCA, posterior cerebral artery.