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Table 1 Sociodemographic characteristics, family history of breast cancer, and hormone use among cases and controls

From: Vitamin D receptor polymorphisms and breast cancer risk in a large population-based case-control study of Caucasian and African-American women

Characteristics Cases (n = 1,631) Controls (n = 1,435)
Age (years)a   
   35 to 39 306 (18.8) 230 (16.0)
   40 to 44 243 (14.9) 246 (17.1)
   45 to 49 260 (15.9) 236 (16.5)
   50 to 54 295 (18.1) 229 (16.0)
   55 to 59 269 (16.5) 265 (18.5)
   60 to 64 258 (15.8) 229 (16.0)
Racea   
   Caucasian 1143 (70.1) 987 (68.8)
   African-American 488 (29.9) 448 (31.2)
Menopausal status   
   Premenopausal 964 (59.1) 784 (54.6)
   Postmenopausal 667 (40.9) 651 (45.4)
History of breast cancera   
   First-degree family history 610 (37.4) 338 (23.6)
   No first-degree family history 969 (59.4) 1057 (73.7)
   Adopted or unknown first degree 52 (3.2) 40 (2.8)
Body mass index (kg/m2)   
   Underweight (<18.5) 31 (1.9) 40 (2.8)
   Normal (18.5 to 24.9) 898 (55.3) 726 (50.7)
   Overweight (25.0 to 29.9) 436 (26.8) 384 (26.8)
   Obese (≥30) 260 (16.0) 283 (19.8)
Oral contraceptive use   
   Never 358 (22.0) 274 (19.1)
   Former 1190 (73.0) 1098 (76.5)
   Current 82 (5.0) 63 (4.4)
Unopposed estrogen hormone therapy useb   
   Never 1004 (61.6) 816 (56.9)
   Former 130 (8.0) 129 (9.0)
   Current (within 6 months) 206 (12.6) 245 (17.1)
Estrogen plus progestin hormone therapy useb   
   Never 1004 (61.6) 816 (56.9)
   Former 75 (4.6) 91 (6.3)
   Current (within 6 months) 241 (14.8) 187 (13)
Smoking status   
   Ever 893 (54.8) 769 (53.6)
   Never 738 (45.2) 666 (46.4)
  1. Proportions in this table reflect the over-sampling of younger cases, African American cases, and women with a family history of breast cancer. Values are expressed as n (%). aCases and controls were sampled according to race, age, study site, and family history of breast cancer. bPercentages do not sum to 100% because of missing values.