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. 2020 Apr 22;10:6822. doi: 10.1038/s41598-020-63343-7

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© The Author(s) 2020

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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Heart rate and complexity of ECG strips obtained using different coarse-graining and complexity estimation techniques. (a) Heart rate of the analysed ECG strips. (b) Complexity of ECG strips processed using threshold-crossing coarse-graining technique. Mean values for the groups indicated by horizontal bars in all panels. (c,d) Complexity of ECG strips processed using beat- detection and feature detection coarse-graining techniques. (e) Receiver operating curve analysis for the LZ76 and Titchener complexity-based detection of PAF using the threshold crossing coarse-graining. (f) Receiver operating curve analysis for the LZ76 and Titchener complexity-based detection of PAF using the feature detection coarse-graining.