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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

From: Intensity and timing of physical activity in relation to postmenopausal breast cancer risk: the prospective NIH-AARP Diet and Health Study

Light activity Total Ages 35-39 years Past 10 years
   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   Ages 35-39 years Past 10 years
   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
  1. *BMI: body mass index.
  2. †Family history of breast cancer in a first-degree female relative.
  3. ‡MHT: menopausal hormone therapy.