| Overall, % (n = 108,907) | Average annual total long-term RPA (h/wk/y), % | ||||
---|---|---|---|---|---|---|
≤0.50(n = 9984) | 0.51–2.50(n = 31,942) | 2.51–4.50(n = 25,442) | 4.51–7.00(n = 19,466) | ≥7.01(n = 22,073) | ||
Race | ||||||
 White | 86.4 | 80.8 | 85.8 | 88.4 | 87.9 | 87.2 |
 Black | 2.7 | 4.2 | 3.1 | 2.4 | 2.4 | 2.4 |
 Hispanic | 4.5 | 5.0 | 4.4 | 3.9 | 4.1 | 4.1 |
 Asian | 3.7 | 7.2 | 4.4 | 3.1 | 2.9 | 2.8 |
 Others/unspecified | 2.8 | 2.8 | 2.3 | 2.2 | 2.6 | 3.5 |
First-degree family history of breast cancer | 11.7 | 12.7 | 12.5 | 12.0 | 11.5 | 11.3 |
History of a breast biopsy | 15.5 | 17.0 | 17.0 | 15.9 | 15.4 | 14.5 |
Had a mammogram in the 2Â years prior to baseline | 74.3 | 84.9 | 83.1 | 80.5 | 77.0 | 73.1 |
BMI, kg/m2 | ||||||
 <25.00 (under/normal weight) | 58.9 | 51.5 | 55.4 | 59.4 | 61.7 | 64.0 |
 25.00–29.99 (overweight) | 23.9 | 25.8 | 24.9 | 24.3 | 23.0 | 21.7 |
 ≥30.00 (obese) | 13.9 | 13.9 | 16.7 | 13.7 | 12.9 | 11.5 |
 Unknown | 3.3 | 4.8 | 2.9 | 2.6 | 2.4 | 2.8 |
Nulliparous | 26.7 | 21.7 | 22.2 | 23.6 | 26.5 | 31.3 |
Menopausal status and MHT use | ||||||
 Premenopausal | 42.6 | 26.4 | 38.5 | 45.6 | 49.1 | 49.7 |
 Peri-/postmenopausal |  |  |  |  |  |  |
  No MHT | 10.6 | 15.1 | 9.7 | 8.3 | 7.9 | 9.1 |
  E only | 14.4 | 17.6 | 14.0 | 11.4 | 10.8 | 11.3 |
  E plus P only | 17.5 | 22.4 | 21.5 | 19.7 | 17.9 | 16.1 |
  Mixed formulations | 6.5 | 7.9 | 6.4 | 5.6 | 5.3 | 5.0 |
  Unknown MHT use | 4.3 | 6.0 | 4.4 | 3.8 | 3.6 | 3.4 |
 Unknown MP status | 4.1 | 4.6 | 5.7 | 5.6 | 5.4 | 5.6 |
History of cigarette smoking | ||||||
 Never | 66.5 | 66.5 | 65.8 | 64.8 | 65.7 | 65.7 |
 Former | 28.4 | 27.7 | 29.0 | 30.4 | 29.3 | 28.5 |
 Current | 5.2 | 5.9 | 5.2 | 4.9 | 5.0 | 5.8 |
Alcohol intake during the year prior to baseline | ||||||
 Nondrinker | 31.7 | 40.4 | 33.7 | 29.6 | 28.7 | 28.2 |
 <15 g/d | 47.9 | 41.3 | 47.9 | 50.6 | 50.6 | 50.1 |
 ≥15 g/d | 15.9 | 13.4 | 14.7 | 16.4 | 17.1 | 18.0 |
 Unknown | 4.5 | 4.9 | 3.7 | 3.4 | 3.6 | 3.7 |