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. 2022 Sep 30;270(1):13–31. doi: 10.1007/s00415-022-11398-z

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Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Cohen’s d values of the comparisons with statistically significant differences of gray matter morphometry parameters. Cells in red reflect comparisons with lower values in patients with persistent headache after COVID-19, while cells in green reflect the opposite trend. *Results obtained exclusively when adding sex as a covariate