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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. 2 — a Category probability curve for item “Have been irritable or in a bad temper” for set of eight items with five response categories. b Category probability curve for item “Backache” for set of eight items with five response categories. Entire sample of students 11, 13 and 15 years old