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. 2021 Aug 20;4:674238. doi: 10.3389/frai.2021.674238

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Copyright © 2021 Vargas-Calixto, Warrick and Kearney.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Feature distributions for (A) LF, (B) MF, and (C) HF (D) LF/(MF + HF) ratio, and (E) ApEn. Each panel show the samples (scattered points) and boxplots for the features for simulated normal (left), the PhysioNet data (middle), and simulated acidosis $F H R_{R R I}$ features (right). The notches, or indentations, in each boxplot indicate the 95% CI for the median of each distribution. These plots show that the PhysioNet data and the simulated normal are not significantly different for any of the features. In contrast, the simulated acidosis distributions are significantly different for the MF and ApEn.