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.

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.