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Table 2 Characteristics of the study sample at enrollment by physical activity (PA) level among 80,202 postmenopausal women from the Norwegian Women and Cancer Study

From: Physical activity and the risk of postmenopausal breast cancer - the Norwegian Women and Cancer Study

  PA level
  Very low Low Moderate High Very high
N 4196 16 773 33 538 20 564 5131
Age (years) 49.1 48.8 48.3 48.1 47.5
Duration of education (years) 11.3 12.2 12.3 12.4 11.6
Weight (kg) 70.8 68.8 66.1 64.5 63.1
Height (cm) 165.7 166.2 166.2 166.4 166.0
Body mass index (kg/m2) 25.8 24.9 23.9 23.3 22.9
Smoking status:      
Never smoker 29.5 34.8 36.2 35.9 33.1
Former smoker 29.6 31.0 32.6 34.6 32.5
Current smoker 41.0 34.2 31.3 29.5 34.2
Pack-years (in former and current smokers) 8.5 6.5 5.5 5.2 5.6
Alcohol consumption (g/day) 3.5 3.5 3.4 3.5 3.1
Age at menarche 13.2 13.3 13.3 13.3 13.4
Oral contraceptive use (ever) 46.2 45.0 45.2 44.7 46.5
Age at first birth (years) 23.4 23.9 23.9 23.9 23.5
Nulliparous 10.8 9.0 8.1 8.0 7.6
Age at menopause (years) 47.6 48.3 48.4 48.3 48.1
Hormone replacement therapy use (current) 27.9 29.0 27.6 28.1 24.5
Self-reported cardiovascular disease (yes) 9.1 5.4 3.9 3.8 4.4
Self-reported diabetes (yes) 3.0 1.7 1.3 1.1 1.2