Table 1.

Baseline characteristics of CPS-II Nutrition Cohort women according to level of recreational physical activity measured as MET expenditure per week

MET-h/wk
None>0–7.0>7–17.5>17.5–31.5>31.5–42.0>42.0
Characteristic(n = 6,747)(n = 25,084)(n = 23,743)(n = 13,649)(n = 2,391)(n = 2,001)
Median MET-h/wk0.03.513.524.535.552.5
Average age in 1992, y62.662.762.762.962.462.6
Age-adjusted percentagea
Race
 White96.997.397.497.497.597.0
 Non-White3.12.72.62.62.53.0
Education
 High school graduate or less47.339.334.934.528.626.1
 Some college or trade29.331.631.631.634.431.5
 College graduate22.728.532.933.236.641.8
 Missing0.70.70.70.70.50.7
Sitting h/d
 <340.546.447.749.051.452.2
 3–543.543.943.441.339.737.1
 6+16.09.88.99.68.910.6
BMI, kg/m2
 <18.52.31.71.82.12.23.7
 18.5–<25.039.747.252.456.762.664.3
 25.0–<30.032.633.331.929.927.323.9
 ≥30.025.417.813.911.37.98.0
Adult weight change
 >5 lb. loss6.15.66.47.58.311.6
 ≤5 lb. gain or loss6.47.99.211.213.515.1
 >5 to 15 lb. gain11.914.517.118.723.321.0
 >15 to 25 lb. gain14.117.218.619.018.517.3
 >25 to 35 lb. gain14.616.316.015.814.713.2
 >35 lb. gain45.737.531.626.721.020.6
Alcohol intake
 Nondrinker54.848.944.142.435.135.0
 <1 drink/d30.235.840.139.943.742.4
 1+ drink/d10.911.112.313.817.517.8
 Missing4.14.23.43.93.74.9
Smoking status
 Nonsmoker50.557.255.253.349.747.8
 Current smoker13.88.87.07.87.58.5
 Former smoker34.332.736.637.641.841.8
 Smoker-status unknown0.40.30.30.40.30.8
 Missing1.00.90.90.90.71.1
Age at menopause, y
 <4526.724.223.724.223.524.3
 45–5463.666.065.865.366.063.9
 55+8.79.09.99.910.010.9
 Missing0.90.70.60.60.50.8
Number live births by age at first live birth
 No live births7.97.67.37.56.57.4
 <24, 1–2 live births16.616.015.216.015.515.1
 25–29, 1–2 live births11.511.512.111.611.813.2
 30+, 1–2 live births6.15.45.35.44.54.8
 <20, 3+ live births8.67.16.66.75.65.1
 20–24, 3+ live births30.832.633.633.035.133.1
 25+, 3+ live births15.717.317.617.318.418.4
 Missing2.82.42.22.52.62.9
PMH use
 Never44.741.840.241.039.539.9
 Current23.827.629.028.428.528.8
 Former18.817.817.517.717.518.0
 Missing12.712.813.412.814.613.3
History of breast cysts
 No72.971.171.272.170.172.7
 Yes27.128.928.827.929.927.3
Organs removed
 None or 1 ovary only59.360.260.960.760.859.8
 Uterus/1 or unknown ovaries17.718.117.517.518.217.4
 Both ovaries20.419.920.020.119.420.7
 Missing2.51.91.51.71.62.1
Family history of breast cancer
 No86.686.186.486.286.385.8
 Yes13.413.913.613.813.714.2
Mammography
 Not within the last year42.134.531.932.129.928.5
 Within the last year56.764.767.367.169.370.9
 Missing1.20.80.80.80.80.7
  • aAdjusted to the age distribution of the Nutrition Cohort women.