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Table 1 Subject’s demographics among six provinces (%)

From: Effects of manganese on routine semen quality parameters: results from a population-based study in China

Characteristics

Hebei

Henan

Shanxi

Guizhou

Zhejaing

Shandong

Total

Age

       

  20–29

24.0

52.1

27.2

25.4

23.9

25.3

29.3

 30–39

28.6

44.5

23.6

26.9

27.3

24.3

29.0

 40–49

27.5

2.2

24.1

24.9

30.2

31.1

23.7

 50–59

19.9

1.2

25.1

22.8

18.5

19.3

18.0

Education

       

 Primary school or lower

6.1

7.6

5.5

10.9

10.2

12.9

8.9

 Junior high school

39.3

44.6

36.2

45.1

41.5

29.2

39.2

 Senior high school or alternative

46.9

20.1

38.2

26.9

33.2

28.7

32.5

 College or higher

7.4

27.7

20.1

17.1

15.1

29.2

19.4

Occupation

       

 Peasant

28.1

40.3

42.7

27.5

20.5

29.9

31.2

 Factory worker

34.7

8.8

27.1

20.2

17.1

17.9

21.0

 Commercial service worker

4.6

19.3

8.5

17.6

17.1

11.9

13.1

 Doctor/teacher/researcher

26.0

23.9

14.1

14.5

34.6

22.4

22.6

 Other

6.6

7.7

7.5

20.2

10.7

17.9

12.1

Income level (Yuan)

       

 <2,000

28.1

33.2

17.6

16.6

0.5

4.0

16.3

 2,000–4,999

59.7

27.7

39.2

26.9

5.4

29.7

31.3

 5,000–9,999

11.7

16.8

38.2

39.4

18.0

24.7

24.9

 10,000-

0.5

22.3

5.0

17.1

76.1

41.6

27.6

Registered residence

       

 Urban

57.7

46.7

50.3

50.8

56.1

57.4

53.3

 Rural

42.3

53.3

49.8

49.2

43.9

42.6

46.7