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Table 1 Age-adjusteda percent distribution of baseline characteristics

From: Recreational physical activity and risk of triple negative breast cancer in the California Teachers Study

 

Overall, %

(n = 108,907)

Average annual total long-term RPA (h/wk/y), %

≤0.50(n = 9984)

0.51–2.50(n = 31,942)

2.51–4.50(n = 25,442)

4.51–7.00(n = 19,466)

≥7.01(n = 22,073)

Race

 White

86.4

80.8

85.8

88.4

87.9

87.2

 Black

2.7

4.2

3.1

2.4

2.4

2.4

 Hispanic

4.5

5.0

4.4

3.9

4.1

4.1

 Asian

3.7

7.2

4.4

3.1

2.9

2.8

 Others/unspecified

2.8

2.8

2.3

2.2

2.6

3.5

First-degree family history of breast cancer

11.7

12.7

12.5

12.0

11.5

11.3

History of a breast biopsy

15.5

17.0

17.0

15.9

15.4

14.5

Had a mammogram in the 2 years prior to baseline

74.3

84.9

83.1

80.5

77.0

73.1

BMI, kg/m2

 <25.00 (under/normal weight)

58.9

51.5

55.4

59.4

61.7

64.0

 25.00–29.99 (overweight)

23.9

25.8

24.9

24.3

23.0

21.7

 ≥30.00 (obese)

13.9

13.9

16.7

13.7

12.9

11.5

 Unknown

3.3

4.8

2.9

2.6

2.4

2.8

Nulliparous

26.7

21.7

22.2

23.6

26.5

31.3

Menopausal status and MHT use

 Premenopausal

42.6

26.4

38.5

45.6

49.1

49.7

 Peri-/postmenopausal

      

  No MHT

10.6

15.1

9.7

8.3

7.9

9.1

  E only

14.4

17.6

14.0

11.4

10.8

11.3

  E plus P only

17.5

22.4

21.5

19.7

17.9

16.1

  Mixed formulations

6.5

7.9

6.4

5.6

5.3

5.0

  Unknown MHT use

4.3

6.0

4.4

3.8

3.6

3.4

 Unknown MP status

4.1

4.6

5.7

5.6

5.4

5.6

History of cigarette smoking

 Never

66.5

66.5

65.8

64.8

65.7

65.7

 Former

28.4

27.7

29.0

30.4

29.3

28.5

 Current

5.2

5.9

5.2

4.9

5.0

5.8

Alcohol intake during the year prior to baseline

 Nondrinker

31.7

40.4

33.7

29.6

28.7

28.2

 <15 g/d

47.9

41.3

47.9

50.6

50.6

50.1

 ≥15 g/d

15.9

13.4

14.7

16.4

17.1

18.0

 Unknown

4.5

4.9

3.7

3.4

3.6

3.7

  1. Abbreviations: BMI body mass index, E estrogen, g/d grams/day, h/wk/y hour/week/year, MHT menopausal hormone therapy, P progestin, RPA recreational physical activity
  2. Results are for 108,907 women aged less than 80 years in the California Teachers Study followed between 1995 and 2012
  3. aAdjusted according to the age distribution (5-year age group) of the 108,907 women who comprise the eligible cohort