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. 2018 Sep 18;13:239. doi: 10.1186/s13018-018-0947-2

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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. 3 — a Comparison of symptom preservation in patients ≤ 65 versus > 65 years of age using Kaplan-Meier analysis. Age did not significantly influence symptom deterioration. b Comparison of symptom preservation in patients with versus without vertebral body slip using Kaplan-Meier analysis. Vertebral body slip (≥ 3 mm) did not significantly influence symptom deterioration. c Comparison of symptom preservation in patients with versus without scoliosis using Kaplan-Meier analysis. Scoliosis (Cobb angle ≥ 10°) did not significantly influence symptom deterioration. d Comparison of symptom preservation in patients with the presence or absence of redundant nerve roots of the cauda equina Kaplan-Meier analysis. Redundant nerve roots of the cauda equina did not significantly influence symptom deterioration