Fig. 2
From: Esketamine and neurocognitive disorders in adult surgical patients: a meta-analysis
Bias Assessment. A Tabular overview presenting the review authors' evaluations on each risk of bias aspect for every study. B Graphical representation illustrating the distribution of review authors' assessments across studies for each risk of bias element. “ + ” denotes a low risk of bias; “?” indicates an unclear risk of bias; “–” signifies a high risk of bias