Table 1. PEDro score for each included studies.

Study	Items of PEDro score											Total score
	1	2	3	4	5	6	7	8	9	10	11
Somers et al., 201220)	+	+	+	+	-	-	+	-	+	+	+	7/10
Helminen et al., 201418)	+	+	+	+	-	-	-	+	+	+	+	7/10
Smith et al., 201530)	+	+	-	+	+	+	+	-	+	+	+	8/10
Bennell et al., 201619)	+	+	+	+	-	-	+	-	+	+	+	7/10
Item criteria
1. Eligibility criteria were specified. 2. Subjects were randomly allocated to groups. 3. Allocation was concealed. 4. The groups were similar at baseline regarding the most important prognostic indicators. 5. There was blinding of all subjects. 6. There was blinding of all therapists who administered the therapy. 7. There was blinding of all assessors 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. Intention to treat. 10. The results of between-group statistical comparisons are reported for at least one key outcome. 11. The study provides both point measures and measures of variability for at least one key outcome.
The total score was defined by the number of positive (+) items.