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. 2015 Apr 22;23:36. doi: 10.1186/s13049-015-0118-y

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© Kim et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Trends in chest compression performance over time. Circles and bars represent means and standard deviations, respectively. Residual leaning rate is the ratio of the number of compressions with residual leaning to the total number of compressions; residual leaning is defined as ≥2.5 kg residual force on the chest at the end of the release phase of each compression.