Table 1

PHASES score⁵

North American, European (not Finnish)	0
Japanese	3
Finnish	5
Hypertension, yes	1
70+ years old	1
<7 mm	0
7.0–9.9 mm	3
10.0–19.9 mm	6
20 mm+	10
Previous aneurysmal SAH (another aneurysm)	1
Site—internal carotid artery	0
Middle cerebral artery	2
Anterior cerebral artery/PCom artery/posterior circulation	4
Risk score	5-year risk of rupture %
2	0.4
3	0.7
4	0.9
5	1.3
6	1.7
7	2.5
8	3.2
9	4.3
10	5.3
11	7.2
12	17.8