Table 1.

Distribution of covariates in case and matched control study participants

Covariate and unit of measureCases
Controls
Median (10th to 90th percentiles)Median (10th to 90th percentiles)
DHEA, (ng/dL)310 (139-634)312 (136-648)
DHEA-S (μg/dL)151 (70-291)149 (63-292)
Age at blood draw (years)49.3 (45.2-53.8)49.3 (45.0-53.8)
BMI at age 18 (kg/m2)20.6 (18.2-24.3)20.9 (18.5-25.6)
Age at menarche (years)12 (11-14)12 (11-14)
Age at first birth (years)24 (21-29)24 (21-28)
Mean yearly alcohol consumption (g/d)2.0 (0-14.9)2.5 (0-15.3)
Dietary folate (g/d)339 (219-607)365 (217-613)
Family history of breast cancer (in first degree relatives)*47 (15.1)65 (11.0)
Use of female hormones in the 3 months before blood collection*63 (21)120 (20.3)
  • NOTE: There were 302 cases and 591 controls. To convert DHEA to nmol/L, multiply by 0.0347, and to convert DHEA to μmol/L, multiply by 0.0271.

  • * Number (percentage) shown.