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. 2015 Jun 18;14:247. doi: 10.1186/s12936-015-0761-9

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© Briët et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Representativeness of studied sites. Funnel plots giving the logarithm of the estimated sampling efficacy for each study (horizontal axis), standard error (se) of this estimate (vertical axis). The vertical line corresponds to the estimated overall average sampling efficacy. The dashed lines correspond to 95% pseudo-confidence limits calculated as 1.96 ± se within which 95% of the points are expected to occur in the event that the differences between studies arise only because of sampling variation.