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. 2019 Aug 12;9:11618. doi: 10.1038/s41598-019-48039-x

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Nominal vs. measured R using calibrated resistors of 0.19, 0.49 and 0.68 kPa.s.L⁻¹. Dashed line represents the theoretical line of identity if a device correctly captured the resistance value. The slopes of the tremoflo vs. IOS are significantly different (p = 0.003), the IOS slope is also significantly different from the theoretical line of identity (p = 0.0028), whereas the tremoflo slope is not significantly different from the theoretical line of identity (p = 0.057).