Fig. 2From: Effects of regional cerebral oxygen saturation monitoring on postoperative cognitive dysfunction in older patients: a systematic review and meta-analysisAssessment of risk of bias based on the version 2 of the Cochrane tool for assessing the risk of bias in randomized trials (RoB2). (a) Percent of studies with categories for risk of bias; (b) Summary for the risk of bias in each studyBack to article page