title: There was evidence of convergent and construct validity of Physiotherapy Evidence Database quality scale for physiotherapy trials.
abstract: OBJECTIVE
  To evaluate the convergent and construct validity of the Physiotherapy Evidence Database (PEDro) scale used to rate the methodological quality of randomized trials in physiotherapy.
  
  
  METHODS
  PEDro total scores and individual-item scores were extracted from 9,456 physiotherapy trials indexed on PEDro. Convergent validity was tested by comparing PEDro total scores with three other quality scales. Construct validity was tested by regressing the PEDro score and individual-item scores with the Institute for Scientific Information Web of Knowledge impact factors (IF) and SCImago journal rankings (SJR) for the journals in which the trials were published.
  
  
  RESULTS
  Testing of convergent validity revealed correlations with the other quality scales ranging from 0.31 to 0.69. The PEDro total score was weakly but significantly associated with IF and SJR (P < 0.0001). Eight of the 10 individual scale items that contribute to the PEDro total score were significantly associated with IF.
  
  
  CONCLUSIONS
  This study provides preliminary evidence of the convergent and construct validity of the PEDro total score and the construct validity of eight individual scale items.
authors.affiliation: Musculoskeletal Division, The George Institute for International Health, The University of Sydney, Sydney, New South Wales, Australia. lmacedo@george.org.au
authors.forename: Luciana Gazzi
authors.initials: LG
authors.lastname: Macedo
authors.forename: Mark R
authors.initials: MR
authors.lastname: Elkins
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Maher
authors.forename: Anne M
authors.initials: AM
authors.lastname: Moseley
authors.forename: Robert D
authors.initials: RD
authors.lastname: Herbert
authors.forename: Catherine
authors.initials: C
authors.lastname: Sherrington
mesh_terms: D003627:Data Interpretation, Statistical; D016208:Databases, Factual; D019317:Evidence-Based Medicine / Q000592:standards*; D005260:Female; D006801:Humans; D008297:Male; D026741:Physical Therapy Modalities / Q000592:standards*; D016032:Randomized Controlled Trials as Topic / Q000379:methods / Q000592:standards*; D011795:Surveys and Questionnaires / Q000592:standards; D016896:Treatment Outcome