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Results The recommendations cover most methodological issues: study design; definition of population of interest; control of bias, sample selection and participation rate; how to access and engage participants, and methods of enquiry; case definition and diagnosis, and algorithm for making headache diagnoses; use of pilot studies; measurement of headache burden. There are also discussions of how to report studies and evaluate other studies, as well as of ethical issues. Conclusion The principles should be useful to researchers whose main interests are in the field of headache, but they also seek to encourage collaborations between specialists in headache disorders and epidemiologists. No conflict of interest.

EHMTI-0205. Methodology guidelines for population surveys of headache prevalence, burden and cost