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. 2014 Mar 15;113(6):1011–1017. doi: 10.1016/j.amjcard.2013.11.062

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© 2014 Elsevier Inc.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).

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(A) Averaged low-frequency to high-frequency (LF:HF) ratio over 3 minutes between control and HC groups. Median and interquartile range. p Values on graph. (B) Averaged LF:HF ratio over 3 minutes among control, nonobstructive, and obstructive groups. Median and interquartile range. p Values on graph.