Table 1.

Characteristics of non-Hispanic white BRCA1 and BRCA2 mutation carriers, by case-control status

	BRCA1 mutation carriers				BRCA2 mutation carriers
	Cases (n=167)		Controls (n=287)		Cases (n=104)		Controls (n=169)
	N	%	N	%	N	%	N	%
Reference age (years)
<30	18	11	77	27	8	8	34	20
30–39	73	44	104	36	51	49	57	34
40–49	76	45	106	37	45	43	78	46
Study site
Australia	75	45	117	41	50	48	84	50
Canada	39	23	11	4	27	26	12	7
USA	53	32	159	55	27	26	73	43
Ascertainment
Clinic-based	99	59	271	94	59	57	148	88
Population-based	68	41	16	6	45	43	21	12
Education
Less than college or university	45	27	51	18	18	17	39	23
Some college or university	67	40	124	43	52	50	66	39
College or university degree	54	33	112	39	31	30	64	38
Unknown	0	0	0	0	3	3	0	0
Family history of breast or ovarian cancer a
Yes	102	61	218	76	56	54	119	70
No	65	39	69	24	48	46	50	30
Full-term pregnancies
0	45	27	97	34	22	21	37	22
1–2	85	51	111	39	48	46	78	46
≥3	37	22	78	27	34	33	54	32

^ain first-degree relatives