The area of each square is proportional to the study's weight in the meta-analysis. The overall meta-analysed measure of effect is often represented on the plot as a dashed vertical line. This meta-analysed measure of effect is commonly plotted as a diamond, the lateral points of which indicate confidence intervals for this estimate.
The size of each square corresponds to the study's contribution to the meta-analysis. The overall effect size from the meta-analysis is usually shown on the graph as a dashed vertical line. This combined effect size is commonly represented as a diamond, with its sides indicating the range of possible values for this estimate.