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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)
  1. Abbreviations: BMI body mass index, HT hormone therapy, IQR interquartile range (25th, 75th percentile)
  2. aControls and cases were matched on age, menopausal status at the time of index mammogram, and year of examination