Table 1.
Selected characteristics of the 825 participants
| Characteristic | Value |
| Ethnicity | |
| White | 262 (31.8%) |
| Japanese American | 361 (43.8%) |
| Native Hawaiian | 202 (24.5%) |
| Menopausal status, hormone replacement therapy at first mammogram | |
| Premenopausal | 201 (24.4%) |
| Postmenopausal, no hormone replacement therapy | 204 (24.7%) |
| Estrogen only hormone replacement therapy | 228 (27.6%) |
| Estrogen and progestin hormone replacement therapy | 192 (23.3%) |
| Case status | |
| Case | 361 (43.8%) |
| Control | 464 (56.2%) |
| Family history (mother or sister) | |
| Yes | 114 (13.8%) |
| No | 711 (86.2%) |
| Mean age over all mammograms (years) | 59.5 ± 8.8 |
| Mean body mass index over all mammograms (kg/m2) | 25.3 ± 5.5 |
| Mean percent dense area (%) | 32.7 ± 22.2 |
| Mean dense area (cm2) | 32.5 ± 25.4 |
| Mean breast area (cm2) | 117.1 ± 60.0 |
Data presented as n (%) or mean ± standard deviation. The set of 825 subjects is the union of the individual sets of 634 to 806 subjects who were genotyped for each polymorphism of interest; that is, 825 subjects had at least one polymorphism of interest genotyped.