CTA Characteristics of the Circle of Willis and Intracranial Aneurysm in a Chinese Crowd with Family History of Stroke

Table 7

The prevalence of intracranial aneurysm with 95% CI by age and gender.

Age	Male			Female			Total
		Aneurysms			Aneurysms			Aneurysms
	Volunteers,	Participants,	Proportion	Volunteers,	Participants,	Proportion	Volunteers,	Participants,	Proportion
			% (95% CI)			% (95% CI)			% (95% CI)
Total	153	15	9.8 (5.0–14.6)	128	14	10.9 (5.5–16.4)	281	29	10.3 (6.7–13.9)
<45 y	43	6	14.0 (3.2–24.7)	33	3	9.1 (2.0–24.0)	76	9	11.8 (4.4–19.3)
45–64 y	93	8	8.6 (2.8–14.4)	89	11	12.4 (5.4–19.3)	182	19	10.4 (6.0–14.9)
≥65 y	17	1	5.9 (0–29.0)	6	0	— (0–46.0)	23	1	4.3 (0–22.0)
value of trend			0.27			0.76			0.38

represents the comparison of <45 y group and 45–64 y group.