(1)Aneurysm prevalence: (a) autopsy-based studies = 14% (95% CI: 11 - 19%);(b) arteriography studies = 16% (95% CI: 10 - 24%); midpoint (15%) selected for analysis.
(2)Annual incidence of aneurysmal rupture = 1.6%.
(3)Morbidity and mortality rates associated with subarachnoid haemorrhage = 70% and50% respectively.
(4)Risk of transfemoral arteriography = 0.2% (95% CI: 0 - 0.4%).
(5)Morbidity and mortality rates associated with surgical treatment of an unrupturedaneurysm = 4.1% and 1.0% respectively.
(6)MRI sensitivity and specificity for patient with aneurysm was 0.95 and 1.0, respectively.