Table 1.

Study characteristics

First author	Country	Year	Study design	aSAH cases	UIA cases	Mean age aSAH	Mean age UIA	Sex (% male) aSAH	Sex (% male) UIA	Dyslipidemia definition
Yoshimura [44]	Japan	2014	Case-control	117	304	60.5	64,3	35	34.2	Statin use and hyperlipidemia in medical records
Vlak [42]	Netherlands	2013	Case-control	250	206	54.7	54.6	24.8	33	Diagnosis of hypercholesterolemia in medical records
Matsukawa [28]	Japan	2013	Case-control	78	62	58	63	34	31	TC >220 mg/dL and/or use of lipid-lowering medicaments
Inagawa [22]	Japan	2010	Case-control	858	798	64.0	65.9	34.6	34.6	TC >220 mg/dL and/or use of lipid-lowering medicaments
Hostettler [19]	UK	2018	Case-control	1729	605	53.2	57.0	29.7	29.8	Statin use and hypercholesterolemia in medical records

aSAH, aneurysmal subarachnoid hemorrhage; UIA, unruptured intracranial aneurysm; TC, total cholesterol