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. 2018 Jun 19;13:151. doi: 10.1186/s13018-018-0853-7

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© The Author(s). 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Isometric trunk muscle strength (Nm) (group mean). p₁—difference between the baseline’s and 3 months’ mean for the training group. p₂—difference between the 3 months’ and 18 months’ mean for the control group. p₃—difference between the baseline’s and 18 months’ mean for the training group. p₄—difference between the baseline’s and 18 months’ mean for the control group. ANOVA_1,2—one-way repeated-measures ANOVA between the baseline’s and 3 months’ mean