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. 2020 Jan 29;20:23. doi: 10.1186/s12903-020-1014-z

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© The Author(s). 2020

Open Access This 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. 4 — Extraction rate for each group of dentists regarding size of periapical radiolucency. Cases of incisors and premolars (a) and those of molars (b) are depicted separately for describing different results from the tooth position. ‘Ref.’ and ‘N/A’ indicate the reference category and ‘not applicable’, respectively (simple logistic regression analysis (p < .05))