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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 ORa Fully adjusted ORb
  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           
  1. 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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