Migraines are believed to be due to a mixture of environmental and genetic factors. It is, however, believed to be a neurovascular disorder. Of the 2725 eligible adults contacted, 2025 (74.3%) responded (females 52.6%, mean age 39.5 ± 13.4 years). Of these, 1273 (62.9%) reported headache 'not related to flu, hangover, cold, head injury' occurring at least once in the previous year.
The gender- and age-standardized 1-year prevalence of migraine was 20.8%. Female gender (odds ratio (OR) = 3.8; 95% confidence interval (CI) 2.8-5.1) and obesity (OR = 1.5; 1.1-2.1) were positively associated with this type of headache. The gender- and age-standardized 1-year prevalence of tension-type headache (TTH) was 30.8%.
A considerable number of individuals reported attacks < 4 h (15.8%) or > 72 h (6.4%). Less than half of the individuals recovered completely between the attacks. Despite this, only every fourth (27%) participant was currently consulting a physician (6% regularly; 21% occasionally). Most of the migraineurs reported absence from school or work, a negative influence of migraine on the most important aspects of life.