August 28, 2019BMJ32,210 citationsOpen Access
RoB 2: a revised tool for assessing risk of bias in randomised trials
Key Points
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Abstract
Assessment of risk of bias is regarded as an essential component of a systematic review on the effects of an intervention. The most commonly used tool for randomised trials is the Cochrane risk-of-bias tool. We updated the tool to respond to developments in understanding how bias arises in randomised trials, and to address user feedback on and limitations of the original tool.