Table 1 Women’s baseline characteristics according to job category and occupational activity

Number at risk

11,464

2388

3727

1462

9453

1033

5570

Number of breast cancer

85

31

18

4

60

4

63

Age, mean, mean (SD)

53.3 (8.5)

50.1 (7,7)

57.4 (8.7)

59.2 (9.9)

54.6 (8.6)

53.2 (8.5)

51 (8.1)

Body mass index, mean (SD)

22.8 (2.9)

22.5 (2.8)

22.7 (2.9)

22.4 (2.9)

22.8 (2.9)

23.1 (3.1)

22.7 (2.9)

 Never smoker

87.9

87.6

85.8

89.7

86.4

81.8

88.7

 Former smoker

1.0

1.1

1.1

1.5

1.1

1.7

1.0

 Current smoker

5.0

6.2

10.9

3.8

4.8

7.1

4.8

 Never drinker

70.1

63.1

69.7

76.1

68.8

66.1

67.6

 Former drinker

1.2

1.4

1.2

6.7

1.4

23.2

1.1

 Current drinker

16.7

21.7

15.2

7.2

18.5

17.3

17.2

Education ≤15 year (%)

33.7

11.7

29.0

40.2

33.1

33.1

22.3

Family history of breast cancer (%)

8.4

7.5

1.7

65.7

8.8

10.6

5.4

 Stressful

21.3

33.6

19.7

11.0

22.2

24.6

28.2

 Normal

56.4

48.6

61.3

29.6

60.8

61.2

56.4

 Less stressful

13.3

11.2

15.3

6.5

14.0

12.1

13.5

Currently married (%)

92.8

91.1

91.1

51.9

94.4

93.2

93.2

Menarche age, mean (SD)

14.7 (1.8)

14.1 (1.6)

14.8 (1.7)

15.4 (1.8)

14.7 (1.7)

14.6 (1.8)

14.4 (1.7)

Menopause age, mean (SD)

48.5 (4.6)

48.4 (5.1)

48.7 (4.4)

48.8 (4.5)

48.4 (4.8)

48.1 (4.6)

48.7 (4.3)

 0

4.0

5.2

3.2

8.3

3.6

4.4

3.8

 1

6.3

8.2

6.3

5.7

6.0

7.7

7.7

 2

39.3

45.1

32.7

29.3

36.1

39.6

44.9

  ≥ 3

46.0

35.4

51.5

52.1

49.8

42.9

37.4

 Never or < 30 min

26.8

35.8

16.3

16.7

20.0

33.1

34.5

 30–59 min

18.3

23.8

16.7

11.3

17.5

21.6

22.1

  ≥ 1 h

50.2

34.6

59.3

26.3

58.0

41.5

40.9

  < 1 h

74.6

70.4

70.6

39.7

74.0

79.9

74.9

 1–2 h

12.9

17.5

11.1

7.2

12.3

12.5

15.4

  ≥ 3 h

7.5

7.1

10.0

6.4

8.9

4.5

7.0