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. 2021 Oct 1;11:19601. doi: 10.1038/s41598-021-99100-7

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© The Author(s) 2021

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 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/.

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Comparison of the physiological metrics (blood oxygen level and HRV) while wearing an FFR and not wearing an FFR. The density plots to the left describe the similarity of the distributions of the two groups. The box-plots in the center column compare the median and the interquartile range (IQR) and provide an assessment of potential outliers. The bar charts to the right compare the plain mean of the two group; the whiskers depict the inner 95% of the recorded data.