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. 2017 Nov 2;18:515. doi: 10.1186/s13063-017-2256-1

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© The Author(s). 2017

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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Fig. 2 — Logarithmic scale frequency distribution of the number of participants per trial (n = 252,099), by trial type. Participants in trials of caries management n = 43,282 (range = 7–8027) and for caries prevention trials n = 208,817 (range = 10–8027)