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. 2018 Aug 20;159(11):2234–2244. doi: 10.1097/j.pain.0000000000001322

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Copyright © 2018 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the International Association for the Study of Pain.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Figure 1. — Distribution of the percentage with at least 50% maximum pain relief related to the number of patients given placebo (red line shows overall average of 12%, N = 7882). Size of symbol indicates the number of patients (inset scale).