Table 2 Percentages and means of the primary and secondary outcomes at baseline, 3 and 12 months

Primary outcomes

Work ability (mean, SD)

39.4

(5.2)

38.9

(5.2)

38.7

(5.2)

38.9

(5.6)

38.9

(5.1)

38.9

(4.6)

Poor (%)

7

4

4

6

0

2

Moderate (%)

21

22

22

22

31

23

Good (%)

50

55

56

52

51

58

Excellent (%)

22

18

18

20

18

17

Vitality

Never (%)

0

0

0

0

0

0

Seldom (%)

2

2

2

0

3

0

Sometimes (%)

16

20

20

17

16

25

Mostly (%)

74

70

73

80

71

68

Always (%)

8

7

5

3

10

8

No productivity loss (%)

43

42

36

43

44

34

Perceived fatigue

18.40

(9.2)

19.52

(10.4)

19.18

(9.9)

21.55

(11.4)

Job content

Job demands

31.66

(4.7)

31.71

(5.4)

32.67

(6.6)

31.15

(5.5)

Decision authority

34.51

(6.4)

34.37

(5.9)

35.60

(7.2)

34.94

(7.4)

Skill discretion

38.77

(4.4)

38.31

(4.0)

38.26

(4.9)

37.21

(4.4)

Support from supervisor

10.95

(2.2)

10.61

(2.1)

11.68

(2.3)

11.71

(2.7)

Co-worker support

12.51

(1.7)

12.22

(1.5)

12.68

(1.8)

12.70

(1.5)

Perceived work attitude

72.22

(14.0)

27.49

(13.5)

70.00

(13.7)

68.30

(14.0)

Self-efficacy

67.01

(6.6)

72.03

(13.0)

66.16

(8.9)

64.70

(10.5)

Willingness to exert effort in completing the behaviour

25.98

(3.2)

25.11

(3.2)

25.44

(3.6)

24.58

(4.4)

Persistence in the face of adversity

25.35

(2.9)

25.23

(2.9)

24.78

(3.6)

24.79

(3.7)

Willingness to initiate behaviour

15.67

(2.8)

15.48

(2.8)

15.93

(3.1)

15.34

(3.4)

Work engagement total

4.41

(0.9)

4.50

(0.9)

4.29

(1.1)

4.44

(0.8)

Vigour

4.55

(0.9)

4.55

(1.0)

4.46

(1.0)

4.62

(0.9)

Dedication

4.76

(1.0)

4.84

(0.9)

4.70

(1.2)

4.77

(1.0)

Absorption

3.94

(1.2)

4.11

(1.1)

3.69

(1.2)

3.94

(0.9)