A Risk of Bias assessment from a published meta-analysis. Table shows 30 studies rated on 10 criteria as 'Yes', 'Uncertain', or 'No'. The overall bias rating is taken as the worst rating across all criteria per study, so a single 'No' rating gives the study a 'High' bias. This particular meta-analysis rated all 30 studies as 'High bias'. So this exercise does not help differentiate between studies.
In #SystematicReview & #MetaAnalysis authors often do #RiskOfBias (RoB) assessments, quantifying whether included studies are 'biased'
Studies may be rated on multiple criteria as Low/Moderate/High bias. The overall RoB may then be the *maximum* level per study
This can produce tables like this: