Table 1.

Criteria for assessing the methodological quality of trials

Criteria	Rating*
Selection bias
(1) Participants were randomly allocated to groups (in a cross‐over study, participants were randomly allocated an order in which treatments were received)	Yes
(2) Allocation was concealed	No
(3) The groups were similar at baseline regarding the most important prognostic indicators	Yes
Performance bias
(4) There was blinding of all participants	No
(5) There was blinding of all therapists who administered the therapy	No
Detection bias
(6) There was blinding of all assessors who measured at least one key outcome	No
Attrition bias
(7) Measures of at least one key outcome were obtained from more than 85% of the participants initially allocated to groups	Yes
(8) All participants for whom outcome measures were available received the treatment or control condition as allocated or, if this was not the case, data for at least one key outcome were analysed by 'intention‐to‐treat'	No
*Yes/No according to criteria used in the OTseeker database (http://www.otseeker.com/scale.htm#1)