Table 1 Baseline characteristics of 6543 women included in nested case-control analysis
From: Body mass index, mammographic density, and breast cancer risk by estrogen receptor subtype
Characteristic | Casesa (n = 1823) | Controlsa (n = 4720) |
|---|---|---|
Age at diagnosis, years (median, IQR) | 60 (52–69) |  |
Age at mammogram, years (median, IQR) | 56 (48–65) | 55 (48–65) |
Race/ethnicity, No. (%) | ||
 Caucasian | 1330 (73.0) | 3365 (71.3) |
 Asian | 301 (16.5) | 844 (17.9) |
 Hispanic/Latina | 69 (3.8) | 143 (3.0) |
 African-American | 69 (3.8) | 199 (4.2) |
 Multiracial | 34 (1.8) | 121 (2.6) |
 Other (not falling in categories above) | 20 (1.1) | 48 (1.0) |
BMI, kg/m2 (median, IQR) | 24.8 (22.0–28.9) | 24.2 (21.6–27.6) |
Menopausal statusa | ||
 Premenopausal | 610 (33.5%) | 1507 (31.9%) |
 Postmenopausal, estrogen use | 140 (7.7%) | 435 (9.2%) |
 Postmenopausal, estrogen + progestin use | 339 (18.6%) | 689 (14.6%) |
 Postmenopausal, no HT use | 734 (40.3%) | 2089 (44.3%) |
Positive family history of breast cancer, No. (%) | 404 (22.2%) | 712 (15.1%) |
Percent density (median, IQR) | 31.8 (16.9–48.4) | 24.7 (12.0–41.0) |