Table 3

 Bleed rates for all locations calculated as annual bleed risk rounded to two significant figures

Groups by aneurysm sizeAnnual risk of rupture (%)
Annual rates of rupture for incidental aneurysms (ISUIA)
<7 mm0.10
7–12 mm1.5
13–24 mm2.7
>24 mm5.3
Annual rates of rupture for additional aneurysms (ISUIA)
<7 mm0.4
7–12 mm0.8
13–24 mm1.2