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. 2017 Nov 30;18(Suppl 1):111. doi: 10.1186/s10194-017-0817-z

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© The Author(s). 2017

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. 1 (abstract P123). — Headache-day frequency calculated using the patient-reported estimate of number of days in a month with headache. Wilcoxon signed-rank test for change versus baseline (level of significance: 5%). The number of patients in follow-up (FU) sessions 9-12 were: FU9, n=67; FU10, n=38; FU11, n=21; FU12, n=16. The mean change from baseline for FU sessions 9-12 were each significant (*P<0.001)