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Table 2 Methodological quality of studies included in the meta-analysis

From: The effect of positive psychology interventions on well-being and distress in clinical samples with psychiatric or somatic disorders: a systematic review and meta-analysis

First author (year)

1. Adequate allocation sequence generation and allocation concealment

2. Blinding of main outcome assessments

3. Description of withdrawals/drop-outs

4. Intention-to-treat analysis is performed or there are no drop-outs

5. The sample size is based on an adequate power analysis.

6. The groups are similar on prognostic indicators at baseline (and this was explicitly assessed) or adjustments were made to correct for baseline imbalance (using appropriate covariates).

7. Diagnostic assessment was conducted by a professional, or there were no diagnostic assessments necessary for the recruitment

Score

Andrewes (2014) [40]

Yes

No

Yes

No

No

Yes

Yes

4

Asgharipoor (2012) [41]

Unclear

No

Unclear

Unclear

No

Yes

Yes

2

Breitbart (2010) [43]

Unclear

Unclear

Yes

No

Yes

Yes

Yes

4

Breitbart (2012) [42]

Yes

Unclear

Yes

No

Yes

Yes

Yes

5

Breitbart (2015) [44]

Unclear

Unclear

Yes

No

Yes

Yes

Yes

4

Celano (2016) [55]

Yes

Yes

No

Yes

Yes

Yes

Yes

6

Cerezo (2014) [46]

Yes

Unclear

No

No

Yes

Yes

Yes

4

Chaves (2017) [47]

Unclear

Yes

Yes

Yes

Yes

Yes

Yes

6

Cohn (2014) [48]

Yes

Yes

No

No

Yes

Yes

Unclear

4

Coote (2012) [49]

Unclear

Yes

No

No

Yes

Yes

No

3

Elham (2015) [50]

No

No

Yes

Yes

Yes

Yes

Yes

5

Fava (1998) [51]

Unclear

Yes

Yes

Yes

No

Unclear

Yes

4

Fava (2005) [52]

Unclear

Yes

No

No

No

Unclear

Yes

2

Henry (2010) [53]

Yes

Yes

Yes

No

No

Yes

Yes

5

Hsiao (2012) [54]

Yes

Unclear

Yes

No

No

Yes

Yes

4

Huffman (2016) [55]

No

No

Yes

No

No

Yes

Yes

3

Kent (2011) [56]

Unclear

Unclear

Yes

Yes

No

Yes

Yes

4

Kerr (2015)

Unclear

Unclear

Yes

Yes

No

Yes

Yes

4

Krentzman(2015) [58]

Unclear

Yes

No

No

No

Yes

Yes

3

Lee (2006) [59]

Yes

Yes

Yes

No

Yes

Yes

Yes

6

Louro (2016) [60]

No

No

Yes

No

No

Yes

Yes

3

Mann (2001) [61]

Unclear

No

No

No

No

Yes

Yes

2

Muller (2016) [62]

Yes

Yes

Yes

No

Yes

Yes

Yes

6

Nikrahan (2016) [63]

Unclear

Unclear

Yes

Yes

Yes

Yes

Yes

5

Pietrowsky (2012) [64]

Unclear

No

No

Yes

No

Yes

Yes

3

Sanjuan 2016 [65]

Yes

Unclear

Yes

No

Yes

Yes

Yes

5

Schrank (2016) [66]

Yes

No

Yes

Yes

Yes

Yes

Yes

6

Seligman (2006) [67] (study 2)

Unclear

Yes

Yes

No

No

Yes

Yes

4

Taylor (2017) [68]

Yes

Unclear

Yes

Yes

No

Yes

Yes

5

Uliaszek (2016) [69]

Yes

No

No

Yes

Yes

Yes

Yes

5