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. 2018 Aug 24;18:192. doi: 10.1186/s12877-018-0880-6

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© The Author(s). 2018

Open AccessThis 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. 1 — Scatter diagrams of the relationships between hand motor variables (handgrip strength, PPT performance) and executive function variables (TMT-A, TMT-B, Digit symbol). Each plot shows the best-fit simple regression line, the correlation coefficient (r) and the statistical significance (p). ^aThe total number of subjects analyzed was 207