PHASES score

ItemsPoints
(P) Population
    North American, European (except Finnish)0
    Japanese3
    Finnish5
(H) Hypertension
    No0
    Yes1
(A) Age
    < 70 years0
    ≥ 70 years1
(S) Size of aneurysm
    < 7.0 mm0
    7.0–9.9 mm3
    10.0–19.9 mm6
    ≥ 20 mm10
(E) Earlier SAH from another aneurysm
    No0
    Yes1
(S) Site of aneurysm
    Internal carotid artery0
    Middle cerebral artery2
    Anterior cerebral artery/posterior communicating artery/posterior circulation4
Risk of rupture of intracranial aneurysms in 5 years
    0.4%≤ 2
    0.7%3
    0.9%4
    1.3%5
    1.7%6
    2.4%7
    3.2%8
    4.3%9
    5.3%10
    7.2%11
    17.8%≥ 12

SAH: subarachnoid hemorrhage; mm: millimeters; PHASES: population, hypertension, age, size of aneurysm, earlier SAH from another aneurysm, site of aneurysm