Table 4.

Familial relative risk for FMD and AAA, as well as absolute risk for DAAD (which includes FMD, AAA, non-abdominal aortic aneurysm, and arterial dissection). Relative risk (RR) and 95% confidence intervals (CI) were computed based upon the distribution of the individuals in each category with the listed findings (n) as compared to the total number of individuals per category (N). Population prevalence (P) of 3.34% for FMD¹⁶ and 4.9% for AAA^17-20 was used to calculate relative risk. The absolute risk is represented by the probability that a relative is affected (p=n/N).

	Family members with FMD				Family members with AAA				Family Member with diagnosed DAAD+AAA
	n	N	p=n/N	RR [95% CI]	n	N	p=n/N	RR [95% CI]	n	N	p=n/N
Female Parents	2	72	2.80%	0.83 [.20 – 3.40]	0	72	-		6	72	8.30%
Male Parents	0	72	-		8	72	11.10%	2.27 [1.12-4.60]	13	72	18.10%
Female Siblings	4	91	4.40%	1.32 [.48 – 3.63	0	91	-		9	91	9.90%
Male Siblings	0	94	-		0	94	-		6	94	6.40%
Female Offspring	5	64	7.80%	2.34 [.95-5.78]	0	64	-		8	64	12.50%
Male Offspring	0	70	-		0	70	-		1	70	1.40%
All Relatives	11	463	2.40%	0.71 [.36-1.39]	8	463	1.70%	0.35 [.17-.74]	43	463	9.30%
Male Relatives	0	236	-		8	236	3.40%	0.69 [.33-1.44]	20	236	8.50%
Female Relatives	11	227	4.80%	1.45 [.75-2.82]	0	227	-		23	227	10.10%
Male Siblings + Male Offspring	0	164	-		0	164	-		7	164	4.30%
Female Siblings + Female Offspring	9	155	5.80%	1.74 [.85-3.56]	0	155	-		17	155	11.00%