Table 1. Assessment of methodological quality of included studies.

	Bredeweg et al. 2012	Brushoj et al. 2008	Van Mechelen et al. 1993	Pope et al. 1998	Pope, et al. 2000	Rudzki 1997	Buist et al. 2008
1. Eligibility criteria were specified	1	0	1	0	0	0	1
2. Subjects were randomly allocated to groups	1	1	1	1	1	1	1
3. Allocation was concealed	1	0	1	0	0	1	1
4. The groups were similar at baseline regarding the most important prognostic indicators	1	1	1	1	1	1	1
5. There was blinding of all subjects	0	1	0	1	1	0	0
6. there was blinding of all therapists who administered the therapy	0	0	0	0	0	0	0
7. There was blinding of all assessors who measured at least one key outcome	0	1	0	1	1	0	0
8. Measures of at least one key outcome were obtained from more than 85% of the subjects initially allocated to groups	0	1	0	1	1	0	1
9. All subjects for whom outcome measures were available received the treatment or control condition as allocated	1	1	0	1	1	1	1
10. The results of between-group statistical comparisons are reported for at least one key outcome	1	1	1	1	1	1	1
11. The study provides both point measures and measures of variability for at least one key outcome	1	1	1	1	1	1	1
TOTAL	7/11	8/11	6/11	8/11	8/11	6/11	8/11