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. 2019 Sep 12;20:421. doi: 10.1186/s12891-019-2787-6

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© The Author(s). 2019

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 — Mean Oxford Knee score for patients with low (n = 205), moderate (n = 203) and high (n = 207) preoperative Pain Catastrophizing Score. Error bars represent 95% confidence intervals