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. 2020 Oct 6;238(12):2805–2818. doi: 10.1007/s00221-020-05933-5

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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. 2 — Visual-analog scales (VAS). As part of the questionnaire the VAS measured the level of concentration during revision (0 = low to 6 = high), the occurrence of feelings of fatigue (0 = none to 6 = always) and the quality of sleep (0 = poor to 6 = good). The scatter plot gives the results of the single subjects as well as the mean and SEM. None of the VAS parameters correlated significantly with the revision time given in the diary or in the questionnaire (for all correlations: Kendall’s tau < 0.15 with p < 0.27)