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Table 2: Comparison of demographic and angiographic data between ruptured and unruptured groups (N = 79)
Variable Ruptured Unruptured Total
Age (mean ± SD), y 55 ± 10 54 ± 11 55 ± 10
Female, N (%) 21 (66) 31 (66) 52 (66)
Aneurysm diameter (mean ± SD), mm 7.4 ± 3.1 7.1 ± 3.4 7.3 ± 3.3
Location of aneurysm 
    Anterior circulation 
    Cavernous ICA 1 1 2
    Paraclinoid ICA* 2 11 (1) 13 (1)
    Posterior communicating artery 4 (1) 3 7 (1)
    ICA dorsal wall 0 2 2
    ICA bifurcation 0 1 1
    Anterior communicating artery 7 9 16
    Pericallosal artery 0 3 3
    MCA bifurcation 2 3 5
    Posterior circulation 
    Basilar artery tip 9 (3) 13 22 (3)
    Superior cerebellar artery 1 1 2
    Vertebrobasilar junction 2 0 2
    Posterior inferior cerebellar artery 4 0 4
Total 32 (4) 47 (1) 79 (5)
Note:—Numbers in parentheses denote retreated aneurysms. ICA indicates internal carotid artery; MCA, middle cerebral artery; Paraclinoid ICA aneurysms included all aneurysms arising from the superior hypophyseal artery, ophthalmic artery, carotid cave, and clinoidal ICA segment.