Table V.

Comparison of observed life-time prevalences of AAA among siblings of AAA probands to spouses' siblings

	Siblings of AAA patients		Siblings of spouses
	n*	AAA† (%)	n*	AAA† (%)	P	OR‡	CI‡
Male	152	44 (29.0)	42	2 (4.8)	.001	8.1	1.9–35.2
Female	181	20 (11.1)	46	0 (0)	.01	11.7	0.7–197.4
Total	333	64 (19.2)	88	2 (2.3)	<.0001	10.2	2.5–42.7

For definitions, see Table I.

^*The 333 siblings of the AAA probands were from 166 AAA probands' families and 88 siblings of the spouses were from 50 spouses' families.

^†All known AAA cases in the study groups were included by combining the number of already known AAA cases with the number of asymptomatic AAA cases identified in this study using ultrasonography examinations (see Table I).

^‡Yates' continuity correction was used.