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. 2016 Jun 28;56(8):1280–1289. doi: 10.1111/head.12878

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© 2016 The Authors Headache published by Wiley Periodicals, Inc. on behalf of American Headache Society

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Baseline median headache‐day frequency for the past month for respondents with CM and EM in the AMPP and CaMEO studies. AMPP, American Migraine Prevalence and Prevention; CaMEO, Chronic Migraine Epidemiology and Outcomes.