Table 1.

Characteristics at blood draw of 2,000 premenopausal women in the NHSII

Average alcohol consumption, g/d
None (n = 618)0.1–10.0 (n = 1,162)10.1–20.0 (n = 157)>20.0 (n = 63)
Age in years (mean, SD)42.7 (4.0)42.7 (4.0)43.1 (4.0)43.7 (4.1)
BMI, kg/m2 (mean, SD)26.8 (7.0)25.9 (7.1)24.4 (5.9)25.0 (5.8)
BMI at age 18, kg/m2 (mean, SD)21.4 (3.3)21.1 (3.1)20.4 (2.2)20.8 (2.4)
Height in inches (mean, SD)64.9 (2.8)64.9 (2.5)65.5 (2.7)65.3 (2.5)
Physical activity in MET-hours/week (mean, SD)14.9 (15.5)18.8 (18.0)21.9 (18.6)24.4 (22.1)
Parous, %84.680.372.076.2
Paritya (mean, SD)2.4 (1.0)2.3 (0.9)2.3 (1.0)2.2 (0.9)
Age at first birtha (mean, SD)26.4 (4.4)26.8 (4.4)26.7 (4.7)27.3 (4.1)
Past oral contraceptive use, %82.485.987.992.1
Past breast feeding history, %68.968.161.268.3
Current smoker, %5.77.417.217.5
Family history of breast cancer, %7.810.211.59.5
Benign breast disease history, %16.217.317.817.5
Caucasian, %94.793.995.595.2
Age at menarche between 12–13 y, %61.758.161.260.3
Usual menstrual cycle pattern regular, %89.393.193.393.6
  • aAmong parous women.