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. 2019 Apr 23;9:6408. doi: 10.1038/s41598-019-42888-2

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© The Author(s) 2019

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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Z-scores of the behavioural data for the normalized hip displacement (NHD). Positive values represent more postural sways, negative values represent less postural sways. (A) NHD-3D (in the three-dimensional space) was lower in the placebo group (red line) compared to the control group (blue line) at T2. Additionally, participants of the placebo group showed lower postural sways at T1 and T2 compared to T0. (B) In the same way, NHD-3D_std was lower in the placebo group compared to the control group at T2. Moreover, NHD-3D_std was lower at T1 and T2 compared to T0 in the placebo group. (C) NHD-ML (in the medial-lateral direction) revealed no significant differences between groups and across sessions. (D) NHD-AP (in the anterior-posterior direction) was lower in the placebo group than the control group at T2. In the placebo group, RLA-AP was lower at T2 and T1 compared to T0. Values are expressed as z-scores ± SE. *p < 0.050.