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. 2018 Jan 15;19(1):4. doi: 10.1186/s10194-018-0834-6

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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.

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Fig. 2 — Difference of gray matter volume between TTH and migraine. A 2 × 2 ANCOVA analysis was used to investigate the effects of headache types (TTH vs. migraine), headache frequency (episodic vs. chronic) and their interaction upon the gray matter volume difference between TTH and migraine. The brain regions with gray matter differences are color-coded in red (TTH > migraine), blue (episodic > chronic) and green (type × frequency interaction). L: left; MIG: migraine; R: right; TTH: tension-type headache