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. 2018 Aug 29;8:13053. doi: 10.1038/s41598-018-31411-8

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© The Author(s) 2018

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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Comparison of heart rate and RR intervals between ECG and radar in the healthy volunteers with NSR Heart rate (A), average RR interval (B) and individual RR intervals (C) measured with IR-UWB radar highly agreed with those measured with ECG. The mean biases were not significant in any of the 3 parameters. There was a proportional difference in the individual RR intervals between ECG and radar. *All Rs were derived from Pearson’s correlation tests. ^†The blue ribbons and the numbers inside the brackets indicate 95% confidence intervals of the mean bias between ECG and radar measurements. ECG, electrocardiography; ICCR, intraclass correlation coefficient R; SD, standard deviation.