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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. 4 — a-d Differential Item Functioning across years of investigation for the item Feeling Low in four Nordic countries. Set of eight items with three response categories. Entire sample of students 11, 13 and 15 years old