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Table 1 Quality assessment per study

From: Positive psychology interventions: a meta-analysis of randomized controlled studies

Study

1

2

3

4

5

6

Total

Abbott 2009 [78]

0

0

1

1

0

1

3

Boehm 2011 [73]

0

1

1

1

0

1

4

Buchanan 2010 [56]

0

0

0

1

0

0

1

Burton 2004 [64]

0

1

1

1

1

0

4

Cheavens 2006 [76]

0

0

1

0

1

0

2

Emmons 2006 study 1

0

1

0

1

0

0

2

Emmons 2006 study 3

0

1

0

1

0

0

2

Fava 1998 [82]

0

1

0

0

1

0

2

Fava 2005 [83]

0

1

0

0

0

0

1

Feldman 2012 [60]

0

0

0

1

0

0

1

Frieswijk 2005

0

0

0

1

0

0

1

Gander 2012 [74]

0

1

1

1

0

0

3

Goldstein 2007 [84]

0

0

0

1

0

0

1

Grant 2009 [79]

0

0

0

0

0

0

0

Grant 2012 [82]

1

1

1

1

0

0

4

Green 2006 [33]

0

0

0

1

1

0

2

Hurley 2012 [61]

0

0

1

1

0

0

2

King 2001 [66]

0

1

0

0

1

0

2

Kremers 2006 [57]

0

0

1

1

1

0

3

Layous 2012 [75]

0

1

1

1

0

0

3

Lichter 1980 study 2 [80]

0

0

0

0

1

0

1

Luthans 2008 [65]

1

1

1

1

0

0

4

Luthans 2010 study 1 [72]

0

1

1

1

1

0

4

Lyubomirsky 2006 study 2 [58]

0

1

1

1

1

0

4

Lyubomirsky 2011 [67]

0

1

1

1

0

0

3

Martinez 2010 [68]

0

1

1

1

1

0

4

Mitchell 2009 [69]

1

1

1

1

0

1

5

Page 2012 [62]

1

0

1

0

0

0

2

Peters 2010 [70]

0

1

1

1

1

0

4

Quoidbach 2009 [59]

1

0

1

0

0

0

2

Schueller 2012 [63]

1

0

1

1

0

0

3

Seligman 2005 [30]

0

1

1

1

1

0

4

Seligman 2006 study 1 [51]

0

0

1

0

0

0

1

Seligman 2006 study 2 [51]

0

1

1

0

1

0

3

Shapira 2010 [55]; Mongrain 2011 [53]; Sergeant 2011 [54]; Mongrain 2012 [52]

1

1

1

1

0

0

4

Sheldon 2002 [32]

0

1

1

1

1

0

4

Sheldon 2006 [34]

0

1

1

0

0

0

2

Spence 2007 [81]

0

0

1

0

0

0

1

Wing 2006 [71]

0

1

0

1

0

0

2

Total

7

23

26

27

14

3

100

  1. Index:
  2. 1 = Randomization concealment.
  3. 2 = Blinding of subjects.
  4. 3 = Baseline comparability.
  5. 4 = Power analysis or N>=50.
  6. 5 = Completeness of follow up data.
  7. 6 = Intention-to-treat analysis.