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. 2017 Apr 20;10:161. doi: 10.1186/s13104-017-2476-1

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© The Author(s) 2017

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. 4 — Average difference across activity classes. Disagreement between Fitbit One and Actigraph step counts increases steadily across the activity classes. The y-axis represents the absolute per-subject mean differences between the devices (scaled by the minutes spent in each class)