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Table 1.

Characteristic of breast cancer cases and controls at baseline

Cases (n = 2,414)*Controls (n = 2,414)*
Japanese American (%) 26.7 16.9 
White (%) 26.9 17.2 
African American (%) 20.7 26.5 
Latino (%) 19.8 27.5 
Hawaiian (%) 5.8 11.8 
Age at baseline (y) 60.8 ± 8.4 58.3 ± 8.6 
Age at blood draw (y) 65.7 ± 8.5 63.0 ± 8.7 
Age at menarche (y) 12.6 ± 1.5 12.7 ± 1.5 
Ever pregnant (%) 89.9 91.6 
Age at first birth(y) 23.9 ± 5.0 22.9 ± 4.7 
Parity 2.6 ± 1.8 3.0 ± 1.9 
Menopausal at baseline (%) 87.2 82.3 
Ever used HRT (%) 57.4 47.7 
Ever smoked (%) 46.2 45.2 
Current drinker (%) 41.8 40.9 
Family history(%) 17.6 11.8 
Body mass index (kg/m226.3 ± 6.1 27.0 ± 6.6 
Folate from foods (μg/d) 356 ± 204 380 ± 252 
Total folate§(μg/d) 505 ± 327 519 ± 354 
Ethanol(g/d) 4.9 ± 15.6 4.3 ± 14.6 
Cases (n = 2,414)*Controls (n = 2,414)*
Japanese American (%) 26.7 16.9 
White (%) 26.9 17.2 
African American (%) 20.7 26.5 
Latino (%) 19.8 27.5 
Hawaiian (%) 5.8 11.8 
Age at baseline (y) 60.8 ± 8.4 58.3 ± 8.6 
Age at blood draw (y) 65.7 ± 8.5 63.0 ± 8.7 
Age at menarche (y) 12.6 ± 1.5 12.7 ± 1.5 
Ever pregnant (%) 89.9 91.6 
Age at first birth(y) 23.9 ± 5.0 22.9 ± 4.7 
Parity 2.6 ± 1.8 3.0 ± 1.9 
Menopausal at baseline (%) 87.2 82.3 
Ever used HRT (%) 57.4 47.7 
Ever smoked (%) 46.2 45.2 
Current drinker (%) 41.8 40.9 
Family history(%) 17.6 11.8 
Body mass index (kg/m226.3 ± 6.1 27.0 ± 6.6 
Folate from foods (μg/d) 356 ± 204 380 ± 252 
Total folate§(μg/d) 505 ± 327 519 ± 354 
Ethanol(g/d) 4.9 ± 15.6 4.3 ± 14.6 

NOTE: Mean ± standard deviation, except when specified as percentages.

*

No. subjects was smaller for some risk factors due to missing data.

Among parous women only.

Family history of breast cancer in mother and sisters.

§

Folate from foods and supplements.

Among drinkers the means were 11.7 ± 22.2 and 10.4 ± 21.2 g/d among cases and controls, respectively.

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