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Table 4 Association between age period of exposure a of stove/fireplace use and breast cancer risk b

From: Indoor air pollution exposure from use of indoor stoves and fireplaces in association with breast cancer: a case-control study

Exposure timing

Controls

Cases

Age-adjusted OR (95% CI)

Multivariable-adjusted OR (95% CI)c

N (%)

N (%)

Any indoor stove/fireplace

    

 Never

228

190

1.00 (reference)

1.00 (reference)

 <20 years of age

196

173

1.09 (0.82, 1.45)

1.28 (0.89, 1.83)

 ≥20 years of age

171

146

1.05 (0.78, 1.40)

1.07 (0.75, 1.52)

Wood burning d

    

 Never

228

190

1.00 (reference)

1.00 (reference)

 <20 years of age

175

156

1.10 (0.83, 1.48)

1.32 (0.91, 1.92)

 ≥20 years of age

167

141

1.03 (0.76, 1.38)

1.05 (0.73, 1.50)

Synthetic log burning

    

 Never

228

190

1.00 (reference)

1.00 (reference)

 <20 years of age

28

23

1.14 (0.63, 2.08)

1.09 (0.46, 2.59)

 ≥20 years of age

65

76

1.47 (1.00, 2.17)

1.65 (1.02, 2.67)

  1. aExposure timing = age (in years) when exposed to indoor air pollution (time periods are not mutually exclusive, see text).
  2. bAmong Long Island, NY women, 1996-1997.
  3. cMultivariate OR adjusted for age, age at menarche, history of breastfeeding, hormone therapy use, family history of breast cancer, parity, age at first birth, BMI at reference, education, smoking history, alcohol intake, physical activity, race, religion, marital status.
  4. dWood burning excludes synthetic logs.