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Baseline characteristics of the study population.
| Variables | Values |
|---|---|
| Number of patients | 324 |
| Mean age (in years) | 55.9 ± 13.6 years |
| Sex | |
| Male | |
| Female | 64% (207/324) |
| WFNS grading | |
| Grade I–III | 56% (183/324) |
| Grade IV–V | 44% (141/324) |
| Fisher grading | |
| Grade 1–2 | 9% (30/324) |
| Grade 3–4 | (91%, 294/324) |
| Aneurysm location | |
| Anterior circulation | 86% (278/324) |
| Posterior circulation | 14% (46/324) |
| Aneurysm treatment | |
| Clipping | 53% (173/324) |
| Coiling | 47% (151/324) |
