| Items |
| MBI ≤ 35 (n) | MBI > 35 (n) | χ2 | P |
| Sex | Female | 3 | 8 | 2.231 | 0.135 |
| Male | 8 | 6 | |||
| Age (years) | ≤50 | 3 | 3 | 0.115 | 0.734 |
| >50 | 8 | 11 | |||
| Years of education | 0 | 0 | 3 | 3.423 | 0.181 |
| ≤12 | 7 | 5 | |||
| >12 | 4 | 6 | |||
| Method of treatment | Clipping | 3 | 4 | 0.005 | 0.943 |
| Coiling | 8 | 10 | |||
| Location of aneurysm | Anterior circulation | 9 | 11 | 0.041 | 0.840 |
| Posterior circulation | 2 | 3 | |||
| Hypertension | Yes | 9 | 8 | 1.724 | 0.189 |
| No | 2 | 6 | |||
| Smoking | Yes | 6 | 2 | 4.588 | 0.032 |
| No | 5 | 12 | |||
| Course of disease | ≤6 month | 8 | 11 | 0.115 | 0.734 |
| >6 month | 3 | 3 | |||
| DCI | Yes | 7 | 8 | 0.108 | 0.742 |
| No | 4 | 6 | |||
| Hydrocephalus | Yes | 8 | 1 | 11.5 | 0.001 |
| No | 3 | 13 | |||
| WFNS-SAH | 1 grade | 1 | 0 | 4.429 | 0.219 |
| 2 grade | 0 | 1 | |||
| 4 grade | 1 | 5 | |||
| 5 grade | 9 | 8 |