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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. 2 — a Comparison of symptom preservation in patients with severe versus mild intermittent claudication using Kaplan-Meier analysis. The outcomes of conservative treatment were worse in patients with severe intermittent claudication at the initial visit (≤ 100 m) than those in patients with mild intermittent claudication (between 100 and 500 m) (p = 0.004). b Comparison of symptom preservation in patients with radicular versus cauda equina or mixed type using Kaplan-Meier analysis. The outcomes of conservative treatment were worse in patients with cauda equina or mixed-type LSS than those in patients with radicular-type LSS (p = 0.039). c Comparison of symptom preservation in patients with versus without lower limb weakness using Kaplan-Meier analysis. The outcomes of conservative treatment were worse in patients with lower limb muscle weakness than those in patients with no muscle weakness (p = 0.049). d Comparison of symptom preservation by absence or presence of block on myelography using Kaplan-Meier analysis. The outcomes of conservative treatment were worse in patients with block on myelography than those in patients with no block on myelography (p = 0.045)