Breast Cancer Research

Table 6 Parental age distributions and odds ratios for breast cancer among African-American and white women by race

From: Birthweight, parental age, birth order and breast cancer risk in African-American and white women: a population-based case–control study

	Minimally adjusted OR^a								Fully adjusted OR^b
	African-American				White				African-American				White
	Case	Control	OR	95% CI	Case	Control	OR	95% CI	Case	Control	OR	95% CI	Case	Control	OR	95% CI
Maternal age (years)^c	n = 107	n = 116			n = 173	n = 120			n = 99	n = 118			n = 164	n = 117
15–18	19	17	2.3	0.9–5.5	12	14	1.1	0.5–2.9	18	15	2.7	1.0–7.0	12	14	1.0	0.4–2.7
19–22 (ref.)	18	33	Ref.		33	47	Ref.		17	33	Ref.		31	44	Ref.
23–27	28	28	1.9	0.9–4.3	59	21	4.2	2.1–8.3	27	28	2.4	1.0–5.4	58	20	4.8	2.3–9.8
28–44	42	38	2.2	1.1–4.6	69	39	2.7	1.5–4.9	37	42	3.3	1.4–7.4	63	39	2.8	1.4–5.4
Mean ± SD	26.4 ± 7.3	25.5 ± 7.0			26.5 ± 5.9	24.9 ± 6.3
Median	26	23			26	22
Range	15–43	16–38			16–43	15–44
Paternal age (years)^d	n = 95	n = 100			n = 171	n = 118			n = 89	n = 94			n = 162	n = 112
15–22	16	15	1.6	0.6–3.9	23	20	0.7	0.3–1.5	16	14	2.7	1.0–7.3	22	19	1.1	0.5–2.5
23–27 (ref.)	22	30	Ref.		51	40	Ref.		20	27	Ref.		49	38	Ref.
28–34	23	28	1.3	0.6–2.8	64	39	1.3	0.8–2.4	22	26	1.3	0.5–3.4	61	36	1.2	0.6–2.4
35–56	34	27	1.9	0.9–4.0	33	19	1.4	0.7–2.8	31	27	2.1	0.8–5.8	30	19	1.1	0.4–2.9
Mean ± SD	30.9 ± 6	30.4 ± 8.0			29.5 ± 6.8	28.8 ± 6.9
Median	30	29			29	27
Range	18–52	19–54			17–53	15–56

^aAdjusted for age and sampling fractions. ^bAdjusted for age, sampling fractions, and other covariates as specified. ^cAdditional covariates for fully adjusted OR: household income ≥$30,000 and birth order. ^dAdditional covariates for fully adjusted OR: adult body mass index >25 kg/m², household income ≥$30,000, birth order, and maternal age.

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