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. 2018 Dec 3;18:298. doi: 10.1186/s12877-018-0993-y

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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. 2 — Beta coefficients of the multiple regression models for prediction of fat free mass in men, using as independent variables age, peak oxygen consumption, gross work efficiency, physical activity level and total physical activity derived from the International Physical Activity Questionnaire. A positive value indicates a direct association