Table 1.

Characteristics of cases and controls

Cases (n = 317)Controls (n = 636)
Age (y), mean (SD)45.4 (4.3)45.1 (4.3)
Age at menarche (y), mean (SD)12.4 (1.3)12.4 (1.4)
Parity*, mean (SD)2.2 (0.8)2.3 (0.9)
BMI at age 18 y (kg/m2), mean (SD)20.9 (3.0)21.0 (2.7)
BMI at blood draw (kg/m2), mean (SD)25.4 (5.3)25.7 (6.1)
Timed (follicular and/or luteal) sample, %62.262.4
Premenopausal at blood collection, %75.475.3
Family history of breast cancer, %16.410.4
History of benign breast disease, %23.715.9
Ever used oral contraceptives, %84.586.3
Current use of postmenopausal hormones at blood collection, %18.917.9
Median (range)Median (range)
DHEA (ng/dL)620 (349-1,075)608 (329-1,014)
DHEAS (μg/dL)84 (44-133)80 (48-140)
  • * Among parous women only.

  • From the median of the bottom quartile (12.5%) to the median of the top quartile (87.5%).

  • For DHEA, there are 314 cases and 631 controls; for DHEAS, there are 315 cases and 630 controls.