Fig. 2From: Effect of remote ischemic preconditioning on postoperative cognitive dysfunction in adult patients with general anesthesia: a meta-analysisRisk bias assessment of Cochrane. a Risk of bias summary. A summary table of review authors’ judgments for each risk of bias item for each study; b Risk of bias graph. A plot of the distribution of review authors’ assessments across studies for each risk of bias item. Note: “+” represents low risk; “?” represents unclear risk; “−” represents high riskBack to article page