Table 1. Characteristics of 2,667,207 observations from 866,033 women in the study cohort by race/ethnicity.
| NH Asian N = 111,209 |
NH Black N = 102,388 |
Hispanic/Latina N = 65,117 |
NH White N = 587,320 |
|
|---|---|---|---|---|
| % | % | % | % | |
| Age Group (years) | ||||
| 40–49 | 32.1 | 28.2 | 40.2 | 28.6 |
| 50–59 | 34.4 | 33.8 | 33.1 | 32.7 |
| 60–69 | 26.4 | 27.3 | 20.2 | 28.2 |
| 70–74 | 7.0 | 10.7 | 6.4 | 10.6 |
| Menopausal status | ||||
| Pre/perimenopausal | 40.6 | 38.5 | 48.2 | 36.6 |
| Postmenopausal | 59.4 | 61.5 | 51.8 | 63.4 |
| BI-RADS breast density | ||||
| Almost entirely fatty | 4.2 | 12.4 | 10.7 | 11.3 |
| Scattered fibroglandular densities | 29.9 | 50.7 | 44.1 | 43.2 |
| Heterogeneously dense | 49.9 | 33.3 | 39.4 | 37.6 |
| Extremely dense | 16.1 | 3.7 | 5.9 | 7.9 |
| Body mass index (kg/m2) | ||||
| Underweight (<18.5) | 3.5 | 0.6 | 0.7 | 1.5 |
| Normal (18.5–24.9) | 61.9 | 13.5 | 25.6 | 39.3 |
| Overweight (25.0–29.9) | 26.1 | 27.5 | 34.4 | 28.7 |
| Obese I (30.0–34.9) | 6.5 | 26.1 | 22.8 | 16.6 |
| Obese II/III (≥35.0) | 2.0 | 32.3 | 16.5 | 14.0 |
| BI-RADS breast density measures per woman | ||||
| 1 | 40.5 | 36.6 | 41.0 | 32.3 |
| 2 | 23.5 | 22.6 | 23.2 | 19.7 |
| 3 | 13.3 | 13.5 | 13.1 | 12.7 |
| 4 | 8.4 | 9.3 | 8.3 | 9.6 |
| 5 or more | 14.2 | 17.9 | 14.3 | 25.6 |
Abbreviations: NH, non-Hispanic/Latina; kg, kilograms; m, meters; BI-RADS, Breast Imaging Reporting and Data System.
*
Frequencies are inversely weighted by the number of observations per woman and rounded.