Table 1 Baseline characteristics according to quintiles of total physical activity in 32,269 women in the Breast Cancer Detection Demonstration Project (BCDDP)*
From: Prospective study of physical activity and risk of postmenopausal breast cancer
Characteristic | Quintile of total physical activity | ||||
|---|---|---|---|---|---|
| Â | 1 | 2 | 3 | 4 | 5 |
Participants (n) | 6453 | 6454 | 6441 | 6472 | 6449 |
Age (years) | 61.7 | 61.1 | 61.3 | 60.8 | 61.0 |
MET-hours/week (range) †| 105 to 244 | 245 to 297 | 298 to 339 | 340 to 394 | 395 to 721 |
Vigorous physical activity (hours/week) | 0.9 | 3.6 | 5.4 | 10.3 | 22.7 |
Non-vigorous physical activity (hours/week) | 14.8 | 32.4 | 46.5 | 54.5 | 59.7 |
Body mass index (kg/m2) | 25.4 | 25.0 | 24.9 | 24.7 | 24.6 |
Height (inches) | 64.3 | 64.2 | 64.2 | 64.2 | 64.1 |
Ever smoked cigarettes (%) | 46.9 | 44.6 | 43.4 | 42.1 | 40.7 |
Education (% more than high school) | 55.0 | 50.0 | 46.8 | 46.1 | 42.0 |
Age at first birth (years) ‡ | 24.0 | 23.9 | 23.8 | 23.9 | 23.5 |
Parity (number of births) ‡ | 2.8 | 2.8 | 2.9 | 2.9 | 3.0 |
Age at menarche (years) | 12.7 | 12.7 | 12.8 | 12.8 | 12.9 |
Age at menopause (years) | 50.4 | 50.3 | 50.2 | 50.4 | 50.3 |
History of oral contraceptive use (%) | 33.8 | 33.2 | 33.4 | 32.8 | 31.1 |
Current menopausal hormone therapy (%) | 55.3 | 54.7 | 55.8 | 55.7 | 54.1 |
Family history of breast cancer (%) ¶ | 34.0 | 35.1 | 34.1 | 34.4 | 33.6 |
History of benign breast disease (%) § | 55.5 | 56.0 | 55.4 | 55.6 | 55.2 |
Total energy intake (kcal/day) | 1252 | 1256 | 1266 | 1271 | 1277 |
Dietary fat intake (g/day) || | 46.9 | 46.5 | 46.3 | 46.0 | 45.9 |
Alcohol intake (g/day) | 4.5 | 4.4 | 4.1 | 4.0 | 3.6 |