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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