Table 1.
Age-adjusted characteristics of postmenopausal women in the study, by alcohol use status at mammogram (NHS and NHSII)
| Characteristic | Alcohol consumption | ||
|---|---|---|---|
| None n=774 |
0–<5 g/day n=713 |
≥5 g/day n=613 |
|
| Mean (SD) | |||
| Percent mammographic density | 24.2 (17.0) | 24.5 (17.1) | 28.7 (19.4) |
| Dense area (cm2) | 47.8 (39.5) | 49.0 (40.6) | 49.0 (40.6) |
| Non-dense area (cm2) | 167.8 (99.2) | 163.7 (89.8) | 133.9 (79.9) |
| Age at mammogram (years)a | 58.2 (8.3) | 57.8 (7.7) | 58.9 (7.4) |
| Age at menarche (years) | 12.5 (1.4) | 12.4 (1.4) | 12.5 (1.4) |
| Age at menopause (years) | 47.5 (6.1) | 47.8 (5.9) | 48.0 (5.5) |
| Body Mass Index (kg/m2) | 27.0 (5.9) | 26.6 (5.4) | 24.8 (3.9) |
| Percentages | |||
| Parity/age at first birth | |||
| Nulliparous | 7 | 8 |
12 |
| Parous, age<25 years | 49 | 48 |
44 |
| Parous, age≥25 years | 44 | 43 | 44 |
| Family history of breast cancer | 11 | 13 | 12 |
| Benign breast disease | 22 | 25 | 21 |
| Never used HT | 37 | 34 | 36 |
| Past HT use | 20 | 20 | 19 |
| Current HT use | 42 | 46 | 45 |
Abbreviations: SD – standard deviation; HT – hormone therapy
a
Value is not age adjusted