Table 1.

Validity of studies based on the PEDro scale.

	Eligibility criteria	Random allocation	Concealed allocation	Baseline comparability	Blind subjects	Blind therapists	Blind assessors	Adequate follow-up	Intention- to-treat analysis	Between-group comparisons	Point estimates and variability	Total
Adams et al. (19)	√	√	0	√	0	0	√	√	√	√	√	8/11
Frederix (20)	√	√	0	√	0	0	√	√	√	√	√	8/11
Haggerty et al. (21)	√	√	0	√	0	0	√	0	0	√	0	5/11
Haller et al. (22)	√	√	√	√	0	0	0	0	√	√	√	7/11
Holmen et al. (23)	√	√	√	√	0	0	√	0	√	√	0	7/11
Hutchesson et al. (24)	√	√	√	√	√	√	√	√	√	√	√	11/11
Kempf et al. (25)	√	√	√	√	0	0	0	√	0	√	0	6/11
Lari et al. (26)	√	√	0	√	0	0	0	√	√	√	√	7/11
Li et al. (27)	√	√	0	√	0	0	0	√	√	√	√	7/11
Maddison et al. (28)	√	√	0	√	0	0	0	√	√	√	√	7/11
Martin et al. (29)	√	√	√	√	0	0	0	√	√	√	√	8/11
Partridge et al. (30)	√	√	√	√	0	0	0	√	0	√	0	6/11
Pfaeffli Dale et al. (31)	√	√	0	0	0	0	0	0	√	√	√	5/11
Sharma et al. (32)	√	√	0	√	0	0	0	√	0	√	0	5/11
Short et al. (33)	√	√	√	√	0	0	0	0	√	√	√	7/11
Simons et al. (34)	√	√	0	√	0	0	0	√	0	√	0	5/11
Spring et al. (35)	√	√	√	√	0	0	√	0	0	√	√	7/11
Wayne et al. (36)	√	√	√	√	0	0	0	0	√	√	√	7/11