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. 2016 Jul 15;5(1):1079. doi: 10.1186/s40064-016-2787-z

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 3 — Disagreement (d_AB) between the MHR variability indices obtained with ECG and PPG, for linear time-domain indices (first row), linear frequency-domain indices (second row), entropy indices (third row) and Poincaré plot indices (fourth row). Disagreement was assessed for the initial (H₁, dot) and final (H₂, cross) 10-min tracing segments (error bars represent the 95 % CI). Note that the zero value corresponds to the minimum disagreement (maximum agreement)