Patient characteristics
| Patient characteristics | Study group (n=65) | Control group (n=65) | χ2/t | P value |
| Age at treatment (years) | 48.93±8.91 | 48.89±8.45 | 0.038 | 0.846 |
| Female sex, n (%) | 46 (71) | 46 (72) | 0.026 | 0.979 |
| Left side, n (%) | 33 (51) | 34 (52) | 0.031 | 0.861 |
| Smoking history, n (%) | 21 (32) | 18 (28) | 0.330 | 0.566 |
| History of arterial hypertension, n (%) | 48 (74) | 51 (78) | 0.381 | 0.537 |
| Mean GCS score | 14.01±1.23 | 14.92±1.19 | −1.460 | 0.147 |
| Hunt and Hess Scale, n (%) | 0.135 | 0.713 | ||
| Grade 0 | 43 (66) | 41 (63) | ||
| Grade 1 | 22 (34) | 24 (37) | ||
| Modified Fisher classification, n (%) | ||||
| Grade 0 | 21 (32) | 17 (26) | 2.757 | 0.599 |
| Grade 1 | 9 (14) | 6 (9) | ||
| Grade 2 | 13 (20) | 11 (17) | ||
| Grade 3 | 15 (23) | 13 (20) | ||
| Grade 4 | 7 (11) | 8 (12) | ||
| Site of aneurysm, n (%) | ||||
| Posterior communicating artery | 30 (46) | 32 (49) | 1.025 | 0.599 |
| Middle cerebral artery | 9 (14) | 12 (18) | ||
| Anterior communicating artery | 26 (40) | 21 (32) | ||
| Shape of aneurysm, n (%) | ||||
| Cystic | 41 (63) | 43 (66) | 0.836 | 0.841 |
| Spindle | 11 (17) | 14 (21) | ||
| Lobulated | 12 (18) | 9 (14) | ||
| Multiple forms | 21 (32) | 23 (35) | ||
| Diameter of aneurysm, n (%) | ||||
| <5 mm | 41 (63) | 40 (62) | 0.537 | 0.764 |
| 5–15 mm | 21 (32) | 20 (31) |
GCS, Glasgow Coma Scale.