Table 1. Univariate analysis for risk factors of MIOR.
| Factors | All (n = 538), Mean ±SD, n (%) or Median (range) | MIOR | ||
|---|---|---|---|---|
| No (n = 470), Mean ±SD, n (%) or Median (range) | Yes (n = 68), Mean ±SD, n (%) or Median (range) | P | ||
| Age (year) | 55.39±13.71 | 55.42±13.45 | 55.18±15.51 | 0.904 |
| Preoperative GCS* | 15 (3–15) | 15 (3–15) | 13 (3–15) | 0.002 |
| Sex | 1.000 | |||
| Women | 337(63%) | 294(63%) | 43(63%) | |
| Men | 201(37%) | 176(37%) | 25(37%) | |
| Surgical experience | 0.009 | |||
| Experienced | 225(42%) | 207(44%) | 18(26%) | |
| Inexperienced | 313(58%) | 263(56%) | 50(74%) | |
| Aneurysm location | 0.057 | |||
| ICA | 238(44%) | 207(44%) | 31(46%) | |
| MCA | 96(18%) | 79(17%) | 17(25%) | |
| ACA | 175(33%) | 155(33%) | 20(29%) | |
| Posterior circulation | 29(5%) | 29(6%) | 0(0%) | |
| Aneurysm size | 0.453 | |||
| <15 mm | 469(87%) | 412(88%) | 57(84%) | |
| 15–25 mm | 49(9%) | 42(9%) | 7(10%) | |
| >25 mm | 20(4%) | 16(3%) | 4(6%) | |
| Lobulated aneurysm | 0.165 | |||
| No | 330(61%) | 294(63%) | 36(53%) | |
| Yes | 208(39%) | 176(37%) | 32(47%) | |
| Ruptured aneurysm | 0.044 | |||
| No | 79(15%) | 75(16%) | 4(6%) | |
| Yes | 459(85%) | 395(84%) | 64(94%) | |
ACA: anterior cerebral artery, GCS: Glasgow Coma Scale, ICA: internal carotid artery, MCA: middle cerebral artery, MIOR: major intraoperative rupture, SD: standard deviation.
*Median (range) and using Mann-Whitney U-test