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Forest plots: trying to see the wood and the trees

Steff C. Lewis,M. Clarke

Published 2001 in British medical journal

ABSTRACT

Few systematic reviews containing meta-analyses are complete without a forest plot. But what are forest plots, and where did they come from? #### Summary points Forest plots show the information from the individual studies that went into the meta-analysis at a glance They show the amount of variation between the studies and an estimate of the overall result Forest plots, in various forms, have been published for about 20 years During this time, they have been improved, but it is still not easy to draw them in most standard computer packages In a typical forest plot, the results of component studies are shown as squares centred on the point estimate of the result of each study. A horizontal line runs through the square to show its confidence interval—usually, but not always, a 95% confidence interval. The overall estimate from the meta-analysis and its confidence interval are put at the bottom, represented as a diamond. The centre of the diamond …

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