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. 2018 Jan 11;22:3. doi: 10.1186/s13054-017-1924-6

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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. 3 — Correlation and Bland and Altman bias between maximal end-inspiratory pleural pressure and high frequency percussive ventilation (HFPV) mean pressures considering all pairs of measurements performed during the study. a N = 58, red line: 95% confidence ellipsis; b N = 58, lines: bias (black dotted) and +2SD/-2SD limits of agreement (red dotted). SD standard deviation