Lower risk of subarachnoid haemorrhage in diabetes: a nationwide population-based cohort study.

27 In another age and sex-matched case–control study of 329 patients diagnosed with aneurysmal SAH, prevalence of DM was lower than that in the general population, although the differences did not reach statistical significance. 28 Data reported in two systemic reviews demonstrated that presence of DM was significantly associated with lower risk of SAH in case–control studies, but not in longitudinal studies. 7 25 In one meta-analysis, data from high-quality studies (n=5) found significant association between aneurysmal S

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