Table 1:

Characteristics of the patients (n = 4160)

Characteristics	Radiation-Related Group (No.) (%)	Control Group (No.) (%)	P Value
Male	24 (70.6)	1730 (41.9)	.001
Age (mean) (yr)	51.4 (SD, 15.0)	58.2 (SD, 13.5)	.003
Hyperlipidemia	3 (8.8)	348 (8.4)	NS
Hypertension	15 (44.1)	2187 (53.0)	NS
Diabetes	2 (5.9)	281 (6.8)	NS
Multiple aneurysms	7 (20.6)	470 (11.4)	NS
Presented with SAH	30 (88.2)	2979 (72.2)	.037

Note:—NS indicates not significant.