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/m2) | 26.3 ± 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/m2) | 26.3 ± 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.