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. 2020 Jul 31;24:477. doi: 10.1186/s13054-020-03176-y

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 2 — Left graph shows the percentage of patients who had activation of at least one of the accessory muscles assessed by the work breathing scale as a function of respiratory rate. Right graph shows the mean and standard deviation of the work breathing scale as a function of respiratory rate with the discontinuous line indicating the contribution of the respiratory rate alone (right). Analysis performed in 110 patients. Overall differences were analyzed using SigmaPlot 12.5 by chi-square on the left and by one-way analysis of variance on the right