Table 2 Characteristics of the study population by light and moderate-to-vigorous intensity physical activity during two periods of life: 118,899 postmenopausal women in the NIH-AARP Diet and Health Study
Light activity | Total | Ages 35-39 years | Past 10 years | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Â | Â | Never/Rarely | <1 hr/wk | 1-3 hrs/wk | 4-7 hrs/wk | >7 hrs/wk | Never/Rarely | <1 hr/wk | 1-3 hrs/wk | 4-7 hrs/wk | >7 hrs/wk |
Participants, No. (%) | 118899 | 5189 (4) | 6121 (5) | 20710 (17) | 29018 (24) | 55602 (47) | 5789 (5) | 6811 (6) | 24450 (21) | 32432 (27) | 47827 (40) |
Age at baseline (yrs) | 62.9 | 62.6 | 62.2 | 62.4 | 62.6 | 63.3 | 62.5 | 62.3 | 62.4 | 62.9 | 63.2 |
BMI, current* (kg/m2) | 26.7 | 27.0 | 27.3 | 26.8 | 26.7 | 26.6 | 28.6 | 28.4 | 27.4 | 26.6 | 26.0 |
BMI at age 18* (kg/m2) | 20.9 | 21.1 | 21.1 | 21.0 | 20.9 | 20.8 | 21.3 | 21.1 | 21.0 | 20.8 | 20.8 |
Caucasian (%) | 91.2 | 85.3 | 85.8 | 89.5 | 91.8 | 93.1 | 84.9 | 85.0 | 90.0 | 92.3 | 93.1 |
College education (%) | 31.5 | 31.8 | 33.6 | 35.0 | 34.3 | 28.9 | 27.5 | 29.8 | 34.0 | 33.8 | 29.6 |
Family history of breast cancer†(%) | 13.7 | 13.1 | 13.8 | 13.4 | 13.5 | 13.9 | 13.6 | 13.3 | 13.4 | 13.6 | 13.8 |
Current smoker (%) | 13.4 | 12.6 | 12.8 | 13.3 | 13.1 | 13.7 | 16.7 | 15.1 | 13.7 | 12.9 | 12.9 |
Ever MHT use‡ (%) | 61.7 | 59.0 | 58.7 | 61.6 | 62.5 | 62.1 | 56.9 | 58.3 | 61.8 | 62.8 | 62.0 |
Age at menarche (yrs) | 12.50 | 12.51 | 12.48 | 12.48 | 12.48 | 12.51 | 12.48 | 12.47 | 12.47 | 12.48 | 12.53 |
Age at first birth (yrs) | 22.98 | 22.98 | 23.33 | 23.30 | 23.23 | 22.73 | 22.75 | 23.04 | 23.20 | 23.14 | 22.81 |
Parity (no. of children) | 2.01 | 1.87 | 1.79 | 1.77 | 1.90 | 2.19 | 1.92 | 1.88 | 1.89 | 1.98 | 2.11 |
Age at menopause(yrs) | 47.02 | 47.01 | 47.31 | 47.32 | 47.34 | 47.24 | 46.59 | 47.00 | 47.20 | 47.43 | 47.34 |
Alcohol intake (g/d) | 6.2 | 6.0 | 6.1 | 6.3 | 6.4 | 6.1 | 6.1 | 5.5 | 6.1 | 6.3 | 6.2 |
Moderate-to-vigorous activity | Â | Ages 35-39 years | Past 10 years | ||||||||
| Â | Â | Never/Rarely | <1 hr/wk | 1-3 hrs/wk | 4-7 hrs/wk | >7 hrs/wk | Never/Rarely | <1 hr/wk | 1-3 hrs/wk | 4-7 hrs/wk | >7 hrs/wk |
Participants, No. (%) | 118899 | 10868 (9) | 10507 (9) | 26715 (23) | 31560 (27) | 37477 (32) | 17028 (14) | 12498 (11) | 29927 (25) | 30231 (25) | 28214 (24) |
Age at baseline (yrs) | 62.9 | 62.8 | 62.5 | 62.5 | 62.7 | 63.4 | 62.9 | 62.5 | 62.7 | 62.9 | 63.1 |
BMI, current* (kg/m2) | 26.7 | 27.6 | 27.3 | 26.8 | 26.5 | 26.4 | 28.7 | 28.0 | 26.9 | 26.0 | 25.4 |
BMI at age 18* (kg/m2) | 20.9 | 21.3 | 21.0 | 20.9 | 20.8 | 20.7 | 21.2 | 21.0 | 20.8 | 20.8 | 20.7 |
Caucasian (%) | 91.2 | 88.0 | 89.1 | 90.9 | 92.6 | 92.6 | 88.7 | 89.7 | 91.4 | 92.7 | 92.4 |
College education (%) | 31.5 | 33.2 | 35.8 | 35.7 | 33.0 | 26.4 | 30.3 | 31.8 | 33.7 | 33.7 | 27.9 |
Family history of breast cancer†(%) | 13.7 | 13.0 | 13.4 | 13.7 | 13.6 | 14.0 | 13.3 | 13.9 | 13.4 | 14.1 | 13.6 |
Current smoker (%) | 13.4 | 12.0 | 12.3 | 12.5 | 13.3 | 14.8 | 15.5 | 14.3 | 13.6 | 12.6 | 12.5 |
Ever MHT use‡ (%) | 61.7 | 56.7 | 60.1 | 63.0 | 63.3 | 61.8 | 57.8 | 60.8 | 62.1 | 64.1 | 61.6 |
Age at menarche (yrs) | 12.50 | 12.38 | 12.48 | 12.48 | 12.49 | 12.55 | 12.40 | 12.46 | 12.48 | 12.52 | 12.56 |
Age at first birth (yrs) | 22.98 | 23.39 | 23.40 | 23.25 | 23.02 | 22.60 | 23.06 | 23.06 | 23.07 | 23.06 | 22.76 |
Parity (no. of children) | 2.01 | 1.74 | 1.81 | 1.89 | 2.02 | 2.22 | 1.88 | 1.95 | 1.99 | 2.04 | 2.09 |
Age at menopause(yrs) | 47.02 | 47.39 | 47.42 | 47.42 | 47.33 | 47.05 | 46.94 | 47.17 | 47.34 | 47.40 | 47.26 |
Alcohol intake (g/d) | 6.2 | 5.7 | 5.9 | 6.3 | 6.5 | 6.2 | 5.8 | 5.8 | 6.1 | 6.4 | 6.5 |