The Forest Plot

A graphical representation of the individual results of each study included in a meta-analysis together with the combined meta-analysis result.

Nabhan AF, Abdelmoula YA. Amniotic fluid index versus single deepest vertical pocket as a screening test for preventing adverse pregnancy outcome. Cochrane Database of Systematic Reviews 2008, Issue 3. Art. No.: CD006593.

The plot also allows readers to see the heterogeneity among the results of the studies.

The results of individual studies are shown as squares centred on each study’s point estimate. A horizontal line runs through each square to show each study’s confidence interval – usually, but not always, a 95% confidence interval.

The overall estimate from the meta-analysis and its confidence interval are shown at the bottom, represented as a diamond. The centre of the diamond represents the pooled point estimate, and its horizontal tips represent the confidence interval.


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