Study	1	2	3	4	5	6	7	8	9	0 1	1 1	Score
Askling et al. (2003)	+	+	-	+	-	-	-	+	+	+	+	6
De Hoyo et al. (2015)	+	+	-	+	-	-	-	+	+	+	+	6
Gual et al. (2016)	+	+	-	+	-	-	-	+	+	+	+	6
Maroto- Izquierdo et al. (2017)	+	+	-	+	-	-	-	+	+	+	+	6
Monajati et al., (2018)	+	+	-	+	-	-	-	+	+	+	+	6
Naczk et al. (2016)	-	+	-	+	-	-	-	+	+	+	+	6
Sabido et al. (2017)	+	-	-	+	-	-	-	+	+	+	+	5
Tous-Fajardo et al. (2016)	+	-	-	+	-	-	-	+	+	+	+	5
Maroto- Izquierdo et al. (2019)	+	+	-	-	-	-	-	+	+	+	+	5

The numbers of the columns corresponded to the following items of the PEDro scale.

1. Eligibility criteria were specified (not included in the score).

2. Subjects were randomly allocated to groups.

3. Allocationwas concealed.

4. The groups were similar at baseline regarding the most important prognostic indicator.

5. There was blinding of all subjects.

6. There was blinding of all therapists who administered the therapy.

7. There was blinding of all consultants who measured at least one key outcome.

8. Measures of at least one key outcome were obtained from more than 85% of the subjects initially allocated to groups.

9. All subjects for whom outcome measures were available received the treatment or control condition as allocated or, in those situations in which this was not the case, data for at least one key outcome was analyzed by intention to treat.

10. The results of between-group statistical comparisons were reported for at least one key outcome.

11. The study provided both point measures and measures of variability for at least one key outcome.