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. 2019 Oct 11;9:14674. doi: 10.1038/s41598-019-51026-x

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Volcano plot of the difference in median and the p-value of the Mann–Whitney U test for the comparison of continuous predictor variables between an SWL outcome of ‘Completely Stone Free’ and ‘Stone Free with CIRFs’. Variables labelled with * have had their median value divided by a factor of ten to allow representation of the ‘Difference in Median’ of all variables on the same scale axis. CIRFs, clinically insignificant residual fragments; HU, Hounsfield units; MPP, mean of the positive pixels; SSD, skin to stone distance.