Stratified analyses
| Adjustment factor | Relative risk | 95% CI |
|---|---|---|
| * Ages were dichotomized at 50 years. | ||
| † Amount of cisternal blood was dichotomized at the median. | ||
| None (crude) | 1.52 | 1.04–2.21 |
| Age* | 1.51 | 1.03–2.22 |
| Gender | 1.53 | 1.05–2.23 |
| Amount cisternal blood† | 1.55 | 1.05–2.30 |
| Posterior circulation aneurysms | 1.53 | 1.04–2.23 |