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. 2019 Feb 6;17:27. doi: 10.1186/s12955-019-1097-x

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© The Author(s). 2019

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. 1 — Person-item threshold distribution for the set of eight items, with five response categories. Entire sample of students 11, 13 and 15 years old. The higher the value, the less psychosomatic symptoms