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. 2018 Jun 20;8:9406. doi: 10.1038/s41598-018-27730-5

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© The Author(s) 2018

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Dunlap effect size and 95% confidence intervals of the differences between workdays and free days. A blank mark denotes a significant difference (p < 0.05) between days and a solid mark the absence of significant differences. The shaded area specifies the interval at which the effect size of the difference between days is trivial (−0.2 < d < 0.2). SPT-static postural test; FPT-Fixed instability postural test; VPT-Variable instability postural test; DPT-Dynamic postural test; EO-eyes open; EC-eyes closed; L-low instability; H-high instability.