Significant variation in the frequency of AH can be explained by the heterogeneity of the inclusion criteria used in different studies and the lack of uniformity in their definitions of AH. 3 4 5 6 7 Women predominated in the sample (75.84%), which is consistent with the fact that intracranial aneurysms represented the main recommendation for performing cerebral DSA, as this cerebrovascular disease is more prevalent in women. 9 Despite some studies having found association between AH and female sex, 2 6 7 in the multivariate analysis this factor did not reach statistical significance.
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