Table 2.

Results of the quality assessment of the selected studies.

Authors; year	Sample size calculation provided	Appropriate measurement methods	Appropriate statistics	Error analysis provided	Blinding	Quality
Denissen et al.; 200026	No	Yes	Yes	Yes	No	Medium
Langhoff et al.; 200838	No	Yes	Yes	No	No	Low
Abtahi et al.; 201037	No	Yes	Yes	No	No	Low
Lee et al.; 201135	No	Yes	Yes	No	No	Low
Abtahi et al.; 201236	No	Yes	Yes	No	Yes	Medium
Abtahi et al.; 201325	No	Yes	Yes	No	No	Low
Alghamdi et al.; 201430	No	Yes	Yes	No	Yes	Medium
Nepal et al.; 201434	No	Yes	Yes	No	No	Low
Pyo et al.; 201431	No	Yes	Yes	No	Yes	Medium
Karlsson et al.; 201533	No	Yes	Yes	No	No	Low
Pura et al.; 201632	No	Yes	Yes	No	No	Low