Table 1

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

Light activity

Total

Ages 15-18 years

Ages 19-29 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

10439 (9)

9199 (8)

26777 (23)

26390 (22)

43700 (37)

5998 (5)

6400 (5)

20987 (18)

27569 (23)

55442 (47)

Age at baseline (yrs)

62.9

62.6

62.4

62.7

62.9

63.1

62.7

62.3

62.5

62.7

63.1

BMI, current* (kg/m2)

26.7

26.4

26.3

26.5

26.7

27.0

26.5

26.5

26.6

26.7

26.8

BMI at age 18* (kg/m2)

20.9

21.0

21.0

20.9

20.9

20.7

21.0

21.1

21.0

20.9

20.8

Caucasian (%)

91.2

89.5

90.4

91.5

91.9

91.8

85.6

88.4

89.8

91.7

92.9

College education (%)

31.5

32.3

32.9

33.0

33.1

29.7

32.9

34.4

35.7

33.9

28.8

Family history of breast cancer(%)

13.7

12.8

13.3

13.7

13.8

13.8

13.5

12.8

13.6

13.5

13.8

Current smoker (%)

13.4

11.2

12.2

13.0

12.9

14.7

11.9

11.8

12.8

13.3

14.0

Ever MHT use(%)

61.7

61.2

60.8

61.3

62.0

62.3

60.7

60.3

61.0

61.6

62.5

Age at menarche (yrs)

12.50

12.52

12.49

12.47

12.47

12.52

12.53

12.51

12.48

12.49

12.50

Age at first birth (yrs)

22.98

23.19

23.34

23.24

23.13

22.64

23.19

23.34

23.24

23.13

22.64

Parity (no. of children)

2.01

1.90

1.92

1.94

2.00

2.09

1.87

1.78

1.78

1.90

2.19

Age at menopause(yrs)

47.02

47.31

47.47

47.47

47.35

47.03

47.08

47.43

47.42

47.40

47.14

Alcohol intake (g/d)

6.2

6.5

6.5

6.5

6.3

5.8

6.2

6.3

6.5

6.4

6.0


Moderate-to-vigorous activity

Ages 15-18 years

Ages 19-29 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

15359 (13)

10080 (9)

25250 (21)

26429 (22)

39845 (34)

11585 (10)

9867 (8)

25686 (22)

30175 (25)

39603 (33)

Age at baseline (yrs)

62.9

62.9

62.8

62.9

62.8

62.8

62.8

62.5

62.6

62.8

63.2

BMI, current* (kg/m2)

26.7

26.7

26.6

26.6

26.6

26.9

27.0

26.8

26.6

26.6

26.8

BMI at age 18* (kg/m2)

20.9

21.3

21.0

21.0

20.8

20.7

21.3

21.1

20.9

20.8

20.7

Caucasian (%)

91.2

90.4

91.1

91.4

92.0

91.6

88.8

90.6

91.1

92.1

92.3

College education (%)

31.5

30.5

31.5

32.4

33.7

30.7

33.7

36.3

35.3

32.8

27.0

Family history of breast cancer(%)

13.7

13.5

12.7

13.7

14.0

13.7

13.4

13.0

13.8

13.6

13.9

Current smoker (%)

13.4

10.1

10.9

12.7

13.4

15.7

10.6

11.2

12.0

13.4

15.7

Ever MHT use(%)

61.7

59.2

60.9

61.5

63.3

62.4

58.4

62.1

62.1

62.9

61.8

Age at menarche (yrs)

12.50

12.42

12.45

12.48

12.50

12.55

12.41

12.46

12.49

12.50

12.54

Age at first birth (yrs)

22.98

23.32

23.26

23.18

23.03

22.66

23.56

23.54

23.40

23.04

22.45

Parity (no. of children)

2.01

1.86

1.94

1.97

2.02

2.09

1.75

1.82

1.88

2.02

2.20

Age at menopause(yrs)

47.02

47.43

47.52

47.46

47.30

46.99

47.49

47.64

47.54

47.30

46.96

Alcohol intake (g/d)

6.2

6.0

6.2

6.3

6.4

6.1

6.0

6.1

6.3

6.3

6.1


*BMI: body mass index.

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

‡MHT: menopausal hormone therapy.

Peters et al. BMC Cancer 2009 9:349   doi:10.1186/1471-2407-9-349

Open Data