Table 1.
Demographics of population.
| Covariate | African American Mean (SD) |
Hispanic Mean (SD) |
|---|---|---|
|
| ||
| Total sample size | 8133 | 3422 |
|
| ||
| Female relative had breast cancer | ||
| Yes | 1216 | 405 |
| No | 1862 | 891 |
| Missing | 5055 | 2126 |
|
| ||
| BMI | 31.2 (6.3) | 29.1 (5.5) |
|
| ||
| Waist-hip ratio | 0.83 (0.068) | 0.82 (0.065) |
|
| ||
| Age at menarche | ||
| 7–11 | 2013 | 889 |
| 12–13 | 4056 | 1672 |
| ≥14 | 2022 | 854 |
| Missing | 42 | 7 |
|
| ||
| Age at last period | 46.4 (7.4) | 47.8 (6.3) |
|
| ||
| Alcohol servings per week | 1.1 (4.3) | 1.28 (3.8) |
|
| ||
| Age at first birth | ||
| None | 495 | 92 |
| <20 | 2109 | 568 |
| 20–29 | 3182 | 1554 |
| ≥30 | 468 | 234 |
| Missing | 1879 | 974 |
|
| ||
| Breastfeed at least one month | ||
| No | 4140 | 1451 |
| Yes | 3858 | 1940 |
| Missing | 135 | 31 |
|
| ||
| Breast cancer incidence | 704 | 212 |
|
| ||
| Invasive breast cancer | 354 | 116 |
|
| ||
| In situ breast cancer | 90 | 23 |
|
| ||
| ER (Invasive/in situ only) | ||
| No | 108 | 21 |
| Yes | 229 | 83 |
| Missing | 107 | 35 |
|
| ||
| PR (Invasive/in situ only) | ||
| No | 137 | 28 |
| Yes | 191 | 68 |
| Missing | 116 | 43 |
|
| ||
| HER2 (Invasive) | ||
| No | 207 | 55 |
| Yes | 43 | 12 |
| Missing | 104 | 49 |
BMI: body mass index; ER: estrogen receptor; PR: progesterone receptor; HER2: Human Epidermal Growth Factor Receptor 2