Skip to main content

Table 7 Birth order distributions and odds ratios for breast cancer among white and African-American women combined

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
  Case Control OR 95% CI Case Control OR 95% CI
Full CBCSc n = 854 n = 785    n = 854 n = 785   
   1st born (ref.) 297 268 Ref.   297 268 Ref.  
   2nd–4th born 406 377 0.9 0.7–1.1 406 377 0.9 0.7–1.1
   5th–14th born 151 140 1.0 0.8–1.3 151 140 1.0 0.8–1.3
   Mean ± SD 2.9 ± 2.3 2.9 ± 2.3       
   Median 2.0 2.0       
   Range 1–14 1–14       
Born ≥1948d,e n = 362 n = 315    n = 164 n = 224   
   1st born (ref.) 117 108 Ref.   84 76 Ref.  
   2nd–4th born 194 158 1.1 0.8–1.6 144 109 0.9 0.6–1.4
   ≥5th born 51 49 1.0 0.6–1.7 37 39 0.6 0.3–1.3
   Mean ± SD 2.8 ± 2.1 2.7 ± 1.2    2.8 ± 2.2 2.9 ± 2.3   
   Median 2.0 2.0    2.0 2.0   
   Range 1–14 1–14    1–14 1–14   
  1. 1Adjusted for age, race, and sampling fractions. 2Adjusted for age, race, sampling fractions, and other covariates as specified. 3Additional covariates for fully adjusted OR: none. 4Additional covariates for fully adjusted OR: adult body mass index >25 kg/m2, household income ≥$30,000 and maternal age.5Restricted to participants born on or after 1 January 1948. CBCS, Carolina Breast Cancer Study; CI, confidence interval; OR, odds ratio.
\