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Background  The Cochrane risk of bias (CROB) tool and Physiotherapy Evidence Database (PEDro) scale are used to evaluate risk of bias of randomized controlled trials. We assessed the level of agreement between the instruments.    Methods  We searched the Cochrane Library to identify trials included in systematic reviews evaluating physical therapy interventions. For trials that met our inclusion criteria (primary reference in Cochrane review, review used CROB (2008 version), indexed in PEDro), CROB items were extracted from the reviews and PEDro items and total score were downloaded from PEDro. Kappa statistics were used to determine the agreement between CROB and PEDro scale items that evaluate similar constructs (e.g., randomization). The total PEDro score was compared to the CROB summary score (% of items met) using an Intraclass Correlation Coefficient. Sensitivity analyses explored the impact of the CROB “unclear” category and variants of CROB blinding items. Kappa statistics were used to determine agreement between different thresholds for “acceptable” risk of bias between CROB and PEDro scale summary scores.    Results  We included 1442 trials from 108 Cochrane reviews. Agreement was “moderate” for three of the six CROB and PEDro scale items that evaluate similar constructs (allocation concealment, participant blinding, assessor blinding; Kappa = 0.479–0.582). Agreement between the summary scores was “poor” (Intraclass Correlation Coefficient = 0.285). Agreement was highest when the CROB “unclear” category was collapsed with “high” and when participant, personnel and assessor blinding were evaluated separately in CROB. Agreement for different thresholds for “acceptable” risk of bias between CROB and PEDro summary scores was, at best, “fair”.    Conclusion  There was moderate agreement for half of the PEDro and CROB items that evaluate similar constructs. Interpretation of the CROB “unclear” category and variants of the CROB blinding items substantially influenced agreement. Either instrument can be used to quantify risk of bias, but they can’t be used interchangeably.

plos one

Agreement between the Cochrane risk of bias tool and Physiotherapy Evidence Database (PEDro) scale: A meta-epidemiological study of randomized controlled trials of physical therapy interventions