Table 4 Worker’s characteristics in the intervention group and control group

Age (years)

56

46.1

10.6

58

46.6

10.9

Gender (male)

22

39.3

25

43.1

 Low education

6

10.7

2

3.4

 Middle-level education

16

28.6

15

25.9

 High education

34

60.7

41

70.7

 Working contract hours a week

56

30.5

9.2

58

30.2

10.9

 Workability^a (range 0–10)^b

50

5.3

2.2

53

5.5

2.7

  Distress (range 0–32)^b

54

18.1

9.1

55

17.9

9.6

  Depression (range 0–12)^b

54

2.9

3.7

57

2.7

3.7

  Anxiety (range 0–24)^b

54

5.2

5.0

55

5.6

5.6

  Somatization (range 0–32)^b

53

9.2

6.0

54

9.4

7.3