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Table 1 Main characteristics of studies included in this meta-analysis

From: Socioeconomic inequalities in effectiveness of and compliance to workplace health promotion programs: an individual participant data (IPD) meta-analysis

First author

Design

Study population characteristics

  

N

Age (mean (SD))

% Female

Socioeconomic position

Low

Intermediate

High

van Berkel [25]

RCT

257

45·5 (9·5)

67%

2%

17%

81%

Brug [26]

RCT

315

39·9 (10·1)

98%

54%

44%

2%

Coffeng [27]

C-RCT1

413

41·3 (10·3)

40%

2%

42%

56%

Engbers [28]

CT

531

45·4 (9·2)

40%

3%

31%

67%

Groeneveld [23]

RCT

816

46·1 (9·3)

0%

76%

24%

0%

Houkes [29]

CT

205

48·6 (9·3)

13%

10%

62%

27%

Kouwenhoven-Pasmooij [30]

C-RCT

451

50·9 (5·6)

18%

18%

53%

28%

Oenema [31]

RCT1

765

41·4 (9·0)

41%

20%

38%

41%

Robroek [32]

C-RCT

924

42·1 (10·1)

51%

22%

33%

45%

Steenhuis [33]

C-RCT

928

38·0 (9·8)

38%

2%

37%

60%

Strijk [34]

RCT

730

52·9 (4·9)

75%

10%

29%

61%

Verweij [35]

C-RCT

522

46·7 (8·3)

37%

12%

35%

53%

Viester [36]

RCT

314

46·6 (9·7)

0%

73%

26%

1%

van Wier [37]

RCT1

1320

43·4 (8·6)

34%

5%

35%

60%

Wierenga [38]

CT

218

43·1 (11·4)

78%

3%

17%

79%

Total

 

8709

44·3 (9·8)

40%

20%

34%

47%

  1. C-RCT = Cluster randomized controlled trial, RCT = Randomized controlled trial, CT = (non-randomized) controlled trial
  2. 1The study by Coffeng et al. consisted of 3 intervention arms with different health promotion programs, the study by van Wier et al. consisted of two arms, the study by Oenema et al. consists of two control arms