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Table 4 Birthweight 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
  Cases Controls ORa 95% CI Cases Controls ORa 95% CI Cases Controls ORb 95% CI Cases Controls ORb 95% CI
Full birthweight dataset n = 86 n = 89    n = 110 n = 78    n = 83 n = 85    n = 108 n = 76   
   Lower tertilec 38 30 1.0 0.5–2.1 35 27 0.9 0.4–1.8 38 29 1.1 0.5–2.2 34 26 0.9 0.4–2.0
   Central tertile 33 29 Ref.   37 25 Ref.   32 27 Ref.   37 24 Ref.  
   Upper tertile 15 30 0.5 0.2–1.0 38 26 1.0 0.5–2.1 13 29 0.4 0.2–1.0 37 26 0.9 0.4–2.0
   Mean ± SD (g)   3251 ± 584     3276 ± 513           
   Median (g)   3211     3239           
   Range (g)   1021–4536     1843–4734           
Restricted datasetd n = 49 n = 37    n = 98 n = 63    n = 47 n = 36    n = 96 n = 61   
   Lower tertilec 26 19 0.7 0.3–2.0 33 24 1.0 0.4–2.1 26 18 0.8 0.3–2.4 32 23 1.1 0.5–2.4
   Central tertile 17 9 Ref.   31 23 Ref.   16 9 Ref.   31 22 Ref.  
   Upper tertile 6 9 0.4 0.1–1.4 34 16 1.5 0.7–3.4 5 9 0.3 0.1–1.2 33 16 1.4 0.6–3.2
   Mean ± SD (g)   3184 ± 463)     3225 ± 497)           
   Median (g)   3147     3232           
   Range (g)   2296–4337     2041–4621           
  1. aAdjusted for age and sampling fractions. bAdjusted for age, sampling fractions, history of previous biopsy, maternal age, and adult body mass index >25 kg/m2. cTertiles are race specific with cutpoints derived from controls. White women: <3062 g, 3062–3458 g, >3458 g; African American women: <3146 g, 3146–3486 g, >3486 g. dBirthweight measured in pounds and ounces and participant delivered in a medical facility by a physician. CI, confidence interval; OR, odds ratio.
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