title: Epidemiology of medication overuse headache in the general Swedish population.
abstract: OBJECTIVE
  The aim was to estimate the prevalence of medication overuse headache (MOH) in Sweden and to analyze the occurrence of this disorder in different population groups.
  
  
  METHODS
  A total of 44,300 randomly selected individuals (55% women), aged 15 years and above, were interviewed in a national telephone survey, using a standardized questionnaire including the International Headache Society criteria for MOH and questions about sociodemographic factors, headache history and medication use.
  
  
  RESULTS
  In Sweden, 3.2% (95% confidence interval (CI) 3.1-3.4), n = 1428) suffer from chronic daily headache (CDH) and out of those, 56% (n = 799) have MOH. The prevalence of MOH is 1.8% (95% CI 1.7-1.9). The mean age of onset was higher among men than women as well as among those with tension-type headache as primary headache compared to those who originally had migraine. A multivariate analysis showed that socioeconomic factors such as having a low level of education and/or a low household income were associated with MOH.
  
  
  CONCLUSIONS
  This is the first Swedish population-based study of MOH and we conclude that MOH is a significant public health problem in Sweden, as it is in other parts of the world.
authors.affiliation: University of Gothenburg, Sweden. Pernilla.Jonsson@socmed.gu.se
authors.forename: Pernilla
authors.initials: P
authors.lastname: Jonsson
authors.forename: Tove
authors.initials: T
authors.lastname: Hedenrud
authors.forename: Mattias
authors.initials: M
authors.lastname: Linde
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000700:Analgesics / Q000009:adverse effects*; D005260:Female; D051271:Headache Disorders, Secondary / Q000139:chemically induced* / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D013548:Sweden / Q000453:epidemiology; D055815:Young Adult
chemical_list: D000700:Analgesics