Aneurysm characteristics in centers with low (group A) and high (group B) numbers of cases/hospital
| Group A (n = 197) | Group B (n = 542) | P Value | |||
|---|---|---|---|---|---|
| No. | % | No. | % | ||
| Location | |||||
| ICA | 89 | 45.2 | 235 | 43.4 | .54 |
| ACA, AcomA | 30 | 15.2 | 107 | 19.7 | |
| MCA | 60 | 30.5 | 158 | 29.2 | |
| VB | 18 | 9.1 | 42 | 7.7 | |
| Aneurysm size (mm) | |||||
| 1–3 | 31 | 15.7 | 100 | 18.5 | .65 |
| 3–6 | 86 | 43.7 | 218 | 40.2 | |
| 7–10 | 54 | 27.4 | 161 | 29.7 | |
| 11–15 | 26 | 13.2 | 63 | 11.6 | |
| Dome-to-neck ratio | |||||
| ≤1.5 | 109 | 55.3 | 278 | 51.3 | .30 |
| >1.5 | 88 | 44.7 | 264 | 48.7 | |