Baseline characteristics
| Characteristic | Results |
| Demographics, mean±SD (range) or % (n/N) | |
| Age | 59.9±12.5 (20–93) (n=851) |
| Female | 75.9% (646/851) |
| Race | |
| White/Caucasian | 78.6% (221/281) |
| Black/African-American | 12.8% (36/281) |
| Asian | 2.1% (6/281) |
| Native American or Alaska Native | 1.1% (3/281) |
| Other | 5.3% (15/281) |
| Medical history, % (n/N) | |
| Smoking | 63.3% (539/851) |
| Diabetes | 14.5% (123/851) |
| Hypertension | 62.2% (529/851) |
| Pre-morbid mRS, % (n/N) | |
| 0 to 2 | 90.5% (496/548) |
| 0 | 55.5% (304/548) |
| 1 | 28.6% (157/548) |
| 2 | 6.4% (35/548) |
| 3 | 2.6% (14/548) |
| 4 | 4.0% (22/548) |
| 5 | 2.9% (16/548) |
| Hunt and Hess score at admission*, % (n/N) | |
| I | 21.9% (57/260) |
| II | 33.5% (87/260) |
| III | 24.2% (63/260) |
| IV | 14.2% (37/260) |
| V | 6.2% (16/260) |
*Four ruptured aneurysm patients with missing Hunt and Hess Classification data