The 1966 Cooperative Study of intracranial aneurysms and SAH found that 50% of subjects with aneurysmal SAH were female. Subarachnoid haemorrhage occurs more commonly in males under 40 and females over 50.9 Regardless of aetiology, SAH most frequently occurs between ages 40 and 60, with the peak between 55 and 60 years of age. The peak incidence of SAH secondary to aneurysms occurred at slightly older ages than SAH from arteriovenous malformations (AVM), with 63% of first haemorrhagic episodes from AVMs occurring between 30 and 40.10
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