Effect of Zinc Supplementation on Maintenance Hemodialysis Patients: A Systematic Review and Meta-Analysis of 15 Randomized Controlled Trials

Figure 2

Risk of bias graph and bias summary: (a) review of authors’ judgments regarding each risk of bias item for each included study and (b) review of authors’ judgments regarding each risk of bias item presented as percentages across all included studies.

(a)

(b)