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Table 1.

Characteristics of the study population by level of physical activity at baseline, 182,862 postmenopausal women, NIH-American Association of Retired Persons Diet and Health Study (1995-1996)

CharacteristicsTotalPhysical activity (times per week)
Inactive<11-23-4≥5
Participants, n (%) 182,862 41,580 (22.7) 26,311 (14.4) 38,713 (21.2) 46,251 (25.3) 30,007 (16.4) 
Age at baseline (y) 62.1 62.4 61.3 61.8 62.4 62.5 
BMI (kg/m226.9 28.6 27.6 26.9 26.0 25.3 
Race/ethnicity (%)       
    White 89.9 88.5 90.2 90.6 90.0 90.8 
    Black 5.5 6.6 5.6 5.0 5.3 4.9 
    Hispanic 1.9 2.3 1.8 1.8 1.9 1.5 
    Asian/Pacific Islander/Native American 1.5 1.4 1.3 1.5 1.7 1.6 
College education (%) 29.6 21.6 28.5 31.0 33.1 34.2 
Family history of breast cancer* (%) 12.4 12.0 12.6 12.5 12.5 12.4 
Current smoker (%) 14.4 19.7 17.6 14.8 10.6 9.6 
Current MHT use (%) 44.9 37.8 45.3 46.0 48.9 47.0 
Age at menarche (y) 12.51 12.46 12.48 12.50 12.53 12.55 
Age at first birth in parous women (y) 22.88 22.68 22.78 22.94 23.02 22.97 
Parity (no. children) 2.01 2.02 2.01 2.00 2.02 1.99 
Age at menopause (y) 46.88 46.46 46.76 46.91 47.11 47.21 
Alcohol intake (g/d) 6.0 5.8 6.1 5.8 6.1 6.3 
Total energy intake (kcal/d) 1,597.4 1,623.5 1,557.3 1,583.2 1,576.1 1,647.4 
CharacteristicsTotalPhysical activity (times per week)
Inactive<11-23-4≥5
Participants, n (%) 182,862 41,580 (22.7) 26,311 (14.4) 38,713 (21.2) 46,251 (25.3) 30,007 (16.4) 
Age at baseline (y) 62.1 62.4 61.3 61.8 62.4 62.5 
BMI (kg/m226.9 28.6 27.6 26.9 26.0 25.3 
Race/ethnicity (%)       
    White 89.9 88.5 90.2 90.6 90.0 90.8 
    Black 5.5 6.6 5.6 5.0 5.3 4.9 
    Hispanic 1.9 2.3 1.8 1.8 1.9 1.5 
    Asian/Pacific Islander/Native American 1.5 1.4 1.3 1.5 1.7 1.6 
College education (%) 29.6 21.6 28.5 31.0 33.1 34.2 
Family history of breast cancer* (%) 12.4 12.0 12.6 12.5 12.5 12.4 
Current smoker (%) 14.4 19.7 17.6 14.8 10.6 9.6 
Current MHT use (%) 44.9 37.8 45.3 46.0 48.9 47.0 
Age at menarche (y) 12.51 12.46 12.48 12.50 12.53 12.55 
Age at first birth in parous women (y) 22.88 22.68 22.78 22.94 23.02 22.97 
Parity (no. children) 2.01 2.02 2.01 2.00 2.02 1.99 
Age at menopause (y) 46.88 46.46 46.76 46.91 47.11 47.21 
Alcohol intake (g/d) 6.0 5.8 6.1 5.8 6.1 6.3 
Total energy intake (kcal/d) 1,597.4 1,623.5 1,557.3 1,583.2 1,576.1 1,647.4 

NOTE: All values, except age, are adjusted for age.

*

Family history of breast cancer in a first-degree female relative.

Adjusted for total energy intake.

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