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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