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. 2018 May 24;19:164. doi: 10.1186/s12891-018-2086-7

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© The Author(s). 2018

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. 4 — Characteristics of intradiscal vacuum phenomena (VPs) in shape classification. a Number of vacuum phenomena (VPs) positive-discs by shape classification in males and females. b Number of VP-positive discs by age group by VP shape classification. The counts of VP-positive discs are written in the graph. Percentages in parentheses indicate the proportion of VP-positive discs of each rupture shape compared with the total number of VP-positive discs by gender (a) and by age group (b)