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. 2020 Dec 23;268(5):1738–1746. doi: 10.1007/s00415-020-10366-9

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© The Author(s) 2020

Open AccessThis 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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Fig. 3 — Bland–Altman plots for test–retest reliability. Bland–Altman plots of the HHD (a–b) and PFD (c–d) for non-neurological controls and patients with MND, respectively. Due to the heteroscedastic nature of the data, we applied a ¹⁰log-transformation. MD mean difference between trials 1 and 2, ICC intraclass correlation coefficient, SEM standard error of measurement, expressed as percentage of the mean on the original scale (Newton) [35]