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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.
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Breast Cancer Research

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