Summary of the characteristics of the two cohorts
| Cohort 1 (1996–2005) | Cohort 2 (2006–2010) | p Value | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 197 patients with 198 aneurysms | 241 patients with 260 aneurysms | ||||||||||
| Characteristics | Mean (SD) | N | % | Median | Range | Mean (SD) | N | % | Median | Range | |
| Women | 133 | 67.5 | 166 | 68.9 | 0.7598 | ||||||
| Age, years | 50.6 (10.5) | 51 (IQR 13) | 16–76 | 49.9 (12.5) | 51 (IQR 17) | 17–76 | 0.6557 | ||||
| Size ≥10 mm | 21 | 10.6 | 36 | 13.5 | 0.2980 | ||||||
| Neck >4 mm | 52 | 26.3 | 52 | 20.0 | 0.1129 | ||||||
| Anterior circulation | 165 | 83.3 | 225 | 86.5 | 0.3392 | ||||||
| ACA | 78 | 39.4 | 102 | 39.2 | 0.9717 | ||||||
| MCA | 28 | 14.1 | 51 | 19.6 | 0.1244 | ||||||
| ICA | 59 | 29.8 | 72 | 27.7 | 0.6213 | ||||||
| Posterior circulation | 33 | 16.7 | 35 | 13.5 | 0.3392 | ||||||
ACA, anterior cerebral artery, ICA, interior carotid artery, MCA, middle cerebral artery.