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. 2015 Aug 5;10(8):e0134589. doi: 10.1371/journal.pone.0134589

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© 2015 Liu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — Funnel plot for evaluation of publication bias. Vertical solid line represents the logarithmic transformation of the overall estimated treatment effect (ie, log [RR]), diagonal dotted lines represent pseudo–95% confidence limits for estimated treatment effect, and the circles represent treatment effects of each of the 9 studies. In the absence of publication bias, graph should represent a funnel, with individual studies clustered around the overall estimated treatment effect symmetrically.