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Table 2 Association of body size and breast cancer risk in women of African ancestry, Women’s Circle of Health Study

From: Body fatness and breast cancer risk in women of African ancestry

 

Pre-menopausal

Post-menopausal

 

Cases/Controls

OR1

95% CI

OR2

95% CI

Cases/Controls

OR1

95% CI

OR2

95% CI

Current BMI*

          

  Underweight/Normal (<25)

102/103

Ref

 

Ref

 

74/68

Ref

 

Ref

 

  Overweight (25–29.99)

150/142

1.02

0.70–1.49

1.05

0.70–1.57

131/132

0.93

0.60–1.44

0.93

0.59–1.47

  Obese (≥30)

217/237

0.89

0.61–1.28

0.92

0.54–1.56

304/276

0.98

0.66–1.45

1.00

0.58–1.72

   p for trend

  

0.40

 

0.65

  

0.94

 

0.86

Current BMI*

          

  Underweight/Normal (<25)

102/103

Ref

 

Ref

 

74/68

Ref

 

Ref

 

  Pre–obese (25–29.99)

150/142

1.01

0.69–1.48

0.98

0.64–1.49

131/132

0.93

0.60–1.44

0.88

0.55–1.41

  Obese Class I (30–34.99)

111/94

1.06

0.70–1.61

0.93

0.54–1.62

146/121

1.08

0.70–1.68

0.98

0.56–1.72

  Obese Class II (35–39.99)

50/68

0.71

0.43–1.17

0.62

0.31–1.26

94/89

0.90

0.56–1.44

0.80

0.41–1.58

  Obese Class III (≥40)

56/75

0.79

0.49–1.29

0.64

0.26–1.56

64/66

0.89

0.53–1.48

0.74

0.31–1.78

   p for trend

  

0.17

 

0.20

  

0.65

 

0.47

BMI one year before reference date**

          

  Underweight/Normal (<25)

115/113

Ref

 

Ref

 

66/77

Ref

 

Ref

 

  Overweight (25–29.99)

138/143

0.86

0.59–1.25

0.90

0.61–1.33

147/140

1.27

0.82–1.96

1.32

0.84–2.07

  Obese (≥30)

214/221

0.91

0.63–1.30

1.00

0.62–1.62

293/254

1.27

0.85–1.89

1.46

0.87–2.44

   p for trend

  

0.74

 

0.88

  

0.41

 

0.22

BMI one year before reference date**

          

  Underweight/Normal (<25)

115/113

Ref

 

Ref

 

66/77

Ref

 

Ref

 

  Pre-obese (25–29.99)

138/143

0.86

0.59–1.25

0.87

0.58–1.29

147/140

1.27

0.82–1.96

1.32

0.83–2.08

  Obese Class I (30–34.99)

121/92

1.17

0.77–1.76

1.16

0.71–1.90

143/129

1.23

0.79–1.90

1.34

0.80–2.27

  Obese Class II (35–39.99)

43/73

0.55

0.33–0.90

0.54

0.28–1.02

87/55

1.70

1.02–2.82

1.97

1.02–3.82

  Obese Class III (≥40)

50/56

0.93

0.56–1.54

0.93

0.43–2.00

63/70

0.98

0.58–1.64

1.19

0.55–2.55

   p for trend

  

0.39

 

0.61

  

0.86

 

0.64

  1. *BMI measured at interview. **Based on self-reported weight one year before reference date and measured height at interview.
  2. OR1: Adjusted for age, ethnicity, country of origin (United States, Caribbean, other), education, family history of breast cancer, history of benign breast disease, age at menarche, age at menopause (for postmenopausal women), parity (continuous), breastfeeding (yes/no), age at first birth, HRT use (ever/never), OC use (ever/never). OR2: Further adjusted for waist circumference.
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BMC Cancer

ISSN: 1471-2407

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