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. 2016 Jun 3;4:32. doi: 10.1186/s40359-016-0138-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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Violin plots with means and 95 % confidence intervals for HF-HRV. The following variables categories are shown: Clinically anxious vs. Control participants (a), Low vs. High worry (b), Low vs. High anxiety (c), Low vs. High depression (d), and Low vs. High stress (e). Violin plots illustrate the distribution of data by showing the probability density of the data at different values. HF-HRV = Absolute high frequency HRV. *p < 0.001