Bleed rates for all locations calculated as annual bleed risk rounded to two significant figures
| Groups by aneurysm size | Annual risk of rupture (%) |
|---|---|
| Annual rates of rupture for incidental aneurysms (ISUIA) | |
| <7 mm | 0.10 |
| 7–12 mm | 1.5 |
| 13–24 mm | 2.7 |
| >24 mm | 5.3 |
| Annual rates of rupture for additional aneurysms (ISUIA) | |
| <7 mm | 0.4 |
| 7–12 mm | 0.8 |
| 13–24 mm | 1.2 |