Table 2. Quality assessment of the studies using the PEDro scale.

Study	Eligibility criteria	Subjects randomly allocated	Concealed allocation	Groups similar at baseline	Blinding of subjects	Blinding of therapists	Blinding of assessors	<15% dropout	intention to treat analysis if necessary	between-group statistical comparisons	Point estimate and variability	Total
Mehler et al.(4)	Yes	Yes	No	Yes	No	Yes	Yes	No	No	Yes	Yes	2/10
Tsuchiyagaito et al.(5)	Yes	No	No	No	No	No	No	Yes	Yes	Yes	No	3/10
Cheon et al.(6)	Yes	No	No	No	No	No	No	Yes	Yes	No	Yes	3/10
Chen et al.(7)	Yes	No	No	Yes	No	No	No	Yes	Yes	Yes	Yes	5/10
Wang et al.(14)	No	Yes	No	No	No	No	No	No	No	Yes	Yes	6/10
Choi et al.(15)	No	No	No	No	No	No	No	Yes	Yes	Yes	Yes	6/10
Zotev et al.(16)	Yes	Yes	No	Yes	No	No	No	Yes	Yes	Yes	Yes	5/10
Zotev et al.(17)	Yes	No	No	No	No	No	No	No	No	Yes	No	5/10
Takamura et al.(18)	Yes	No	No	No	No	No	No	Yes	No	Yes	Yes	2/10
Young et al.(19)	Yes	No	No	No	No	No	No	Yes	Yes	No	No	3/10
Young et al.(20)	No	No	No	Yes	No	No	No	Yes	Yes	Yes	Yes	9/10
Schneider et al.(21)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	no	Yes	Yes	4/10
Liu(22)	No	No	No	Yes	No	No	No	Yes	Yes	Yes	Yes	3/10