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. 2021 Feb 4;162(9):2320–2330. doi: 10.1097/j.pain.0000000000002231

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Copyright © 2021 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 6. — Funnel plot of meta-analysis 1 examining the ketamine effect within 3 hours of a single administration. Each symbol represents an independent comparison.