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. 2021 Mar 4;11:5262. doi: 10.1038/s41598-021-84696-7

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Intra-rater reliability of the action units (AU) composing the Feline Grimace Scale by raters with different degrees of expertise in feline pain assessment. Intra-rater reliability was assessed using a two-way mixed effects intra-class correlation coefficient (ICC) for absolute agreement (raters: n = 5/group). Estimates for ICC single measures, accompanied by their 95% confidence intervals are presented. Interpretation was as following: ICC < 0.5 = poor (pink), 0.5–0.75 = moderate (yellow), 0.75–0.9 = good (green), and > 0.90 = excellent reliability (blue)³⁴. The veterinarian group was composed by individuals with experience in pain assessment.