Table 1. Characteristics at blood draw of 2,000 premenopausal women in the Nurses' Health Study II.
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|---|---|---|---|---|
| Average alcohol consumption (grams per day) | ||||
|
| ||||
| None | 0.1-10.0 | 10.1-20.0 | >20.0 | |
| (n=618) | (n=1,162) | (n=157) | (n=63) | |
| Age in years (mean, sd) | 42.7 (4.0) | 42.7 (4.0) | 43.1 (4.0) | 43.7 (4.1) |
| Body mass index, kg/m2 (mean, sd) | 26.8 (7.0) | 25.9 (7.1) | 24.4 (5.9) | 25.0 (5.8) |
| Body mass index 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-hrs/week (mean, sd) | 14.9 (15.5) | 18.8 (18.0) | 21.9 (18.6) | 24.4 (22.1) |
| Parous (%) | 84.6 | 80.3 | 72.0 | 76.2 |
| 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 (%) | 82.4 | 85.9 | 87.9 | 92.1 |
| Past breast feeding history (%) | 68.9 | 68.1 | 61.2 | 68.3 |
| Current smoker (%) | 5.7 | 7.4 | 17.2 | 17.5 |
| Family history of breast cancer (%) | 7.8 | 10.2 | 11.5 | 9.5 |
| Benign breast disease history (%) | 16.2 | 17.3 | 17.8 | 17.5 |
| Caucasian (%) | 94.7 | 93.9 | 95.5 | 95.2 |
| Age at menarche between 12-13 years (%) | 61.7 | 58.1 | 61.2 | 60.3 |
| Usual menstrual cycle pattern regular (%) | 89.3 | 93.1 | 93.3 | 93.6 |
a
Among parous women