TABLE 1.

Aneurysm Sizes and Locations

	Controls	Cases
	n = 198	n = 57
Age
<50 yr	62	12
50-69 yr	101	30
70+ yr	35	15
Gender
Male	45	16
Female	153	41
Size (largest diameter, any direction)
<3 mm	8	1
3-5 mm	24	9
6-8 mm	25	7
9-11 mm	39	7
12-14 mm	37	12
15-25 mm	40	9
>25 mm	25	12
Location
Internal carotid	58	7
Anterior cerebral/ACOM	8	7
Middle cerebral	29	9
Basilar trunk	2	2
Posterior communicating	49	18
Posterior cerebral	5	1
Basilar apex	31	11
Other posterior circulation	16	2

ACOM, anterior communicating artery