Influence of Role-expectancy on Patient Reported Outcomes Among Patients With Migraine: a Randomized Clinical Trial

After agreeing to participate, migraine patients were randomly given the briefing information and therefore their group allocation. Patients received the cover stories via the allocated flyer with study information and also by the physician from the outpatient clinic. Fifty percent of patients (Migraine as Patients \[MP\]) received the information that they will take part in a migraine study (compared to healthy controls) and that this study would investigates migraine associated dizziness by watching a visual stimulus (roller coaster video). The protocol for the intervention was standardized and identical for all participants. The other 50% (Migraine as Healthy \[MH\]) received the information that this study was in cooperation with the University's vertigo Department and that they will take part as controls since they were healthy apart from their migraine.