Fig. 3: Funnel plot showing estimated prevalence of hypertension in paediatric Turner syndrome using transformed proportions.
From: The prevalence of hypertension in paediatric Turner syndrome: a systematic review and meta-analysis

Each dot represents a separate study. The double-arscine transformed proportion of children and adolescents with Turner syndrome <18 years with hypertension relative to the total sample size (as a measure of prevalence) in each individual study on the x-axis plotted against its standard error (as a measure of study precision) on the y-axis. Visual inspection suggested no asymmetry.