3.3 Quality of the studies reported on PEs
Overall, there were two high quality trials (7, 24), three moderate quality trials (6, 26, 27) and two low quality trials (5, 25). None of the seven trials included the blinding of the therapists; all trials except two (7, 24) did not satisfy the domain for blinding of the participants. Similarly, all trials except one (24) met the criteria on the allocation of concealment; and all trials except two (6, 24) did not blind the assessors. The PEDro scores of the individual studies were shown in the Table 2.