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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.