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. 2021 Jan 8;21(2):406. doi: 10.3390/s21020406

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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SDNN, CVRR and STD HR by grade and color (normalized on white color). (A) Normalized SDNN values (ms), (B) Normalized CVRR values (n.u.) and (C) Normalized STD HR (beats / min). Normalized values of each parameter are calculated by subtracting the parameter value for white background from the values for each of the background / overlay colors. Bar plots show the normalized data for all background and overlay colors (overlay colors labeled with "o" on x-axis), where second and third grader’s values are presented with blue and red colored bars, respectively. Error bars denote standard errors of the mean.