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Forest plot of studies that evaluated the effect of aloe vera on primary outcomes compared with placebo. Each block represents a study. Size of square is proportional to the precision of the estimate. Each square represents the weighted mean difference (WMD) or standardized mean difference (SMD) for each study with 95% confidence interval (CI) indicated by horizontal line. FBG, fasting blood glucose; HbA1c, hemoglobin A1c.
