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Sleep quality improvement by repeated administration of V. officinalis. Ten studies were included in meta-analysis. Positive values indicate enhanced sleep quality. (A) Forest plot for sleep quality improvement. Effect sizes (Hedges’ g) for 10 studies (blue circles) and combined effect size (green circle) are shown. Black horizontal bars indicate 95% CI. (B) Funnel plot. Included data points are presented as filled blue circles and imputed data are shown as open orange circles.
