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. 2017 Dec 12;38(5):959–969. doi: 10.1177/0333102417744362

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© International Headache Society 2017

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — Proportions of treated attacks per subject that achieved responder (a) or pain-free (b) status within 30 minutes (ITT population). (a) Responder status. Differences (±SE) between treatment groups are 15.1 (7.3) for all CH, 32.0 (15.0) for eCH, and 8.1 (8.1) for cCH. (b) Pain-free status. Differences (± SE) between treatment groups are 7.8 (6.4) for all CH, 23.9 (14.4) for eCH, and 1.3 (6.5) for cCH.

nValues denote numbers of patients; p values are from the Wilcoxon rank sum test stratified by study site.

Abbreviations: cCH: chronic cluster headache; CH: cluster headache; eCH: episodic cluster headache; ITT: intent-to-treat; nVNS: non-invasive vagus nerve stimulation; SD: standard deviation; SE: standard error.