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. 2018 Jan 26;8:1649. doi: 10.1038/s41598-018-19888-9

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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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Absolute correlation coefficients between diurnal variability measures and standard deviation of MZ measures to show how correlations vary across subject groups. Each spider plot represents a pair of diurnal HR, acceleration or vertical acceleration with negative MZ, positive MZ or irritable MZ measures. stdPhase, stdMESOR and stdAmplitude denote the standard deviation of the differences between the daily and total sinusoid fit. diffPhase, diffMESOR and diffAmplitude denote the standard deviation of successive differences in the daily sinusoid fits. RMS is the root mean square error between the daily and total sinusoid fits.