title: Prevalence, severity and risk factors of restless legs syndrome in the general adult population in two Scandinavian countries.
abstract: OBJECTIVE
  To estimate prevalence and severity (using the International Restless Legs Syndrome Study Group Rating Scale (IRLS)) and to identify risk factors of restless legs syndrome (RLS).
  
  
  METHODS
  Population-based cross-sectional study; 2005 randomly selected adults 18 years and above participated in a telephone interview in Norway and Denmark, employing the next-birthday technique.
  
  
  RESULTS
  Of the cross-section, 11.5% fulfilled the diagnostic criteria for RLS. Half of these reported the symptoms as moderate to very severe. Mean duration of the complaint was 10 years. Prevalence was higher in females than in males (13.4 vs 9.4%) and lowest in the youngest age group (18-29 years, 6.3%). From 30 years and above, no clear age-related difference was seen. Main predictors of RLS were insomnia (odds ratios: 1.71-3.16) and symptoms of periodic limb movements in sleep (3.20-7.85). The response rate was 47%, making the results less reliable.
  
  
  CONCLUSIONS
  This study indicates that there is a high occurrence of RLS among adults. Main predictors are insomnia and periodic limb movements in sleep.
authors.affiliation: Department of Public Health and Primary Health Care, University of Bergen, Kalfarveien 31 N-5018, Bergen, Norway. bjorn.bjorvatn@isf.uib.no
authors.forename: Bjørn
authors.initials: B
authors.lastname: Bjorvatn
authors.forename: Lena
authors.initials: L
authors.lastname: Leissner
authors.forename: Jan
authors.initials: J
authors.lastname: Ulfberg
authors.forename: Jens
authors.initials: J
authors.lastname: Gyring
authors.forename: Merete
authors.initials: M
authors.lastname: Karlsborg
authors.forename: Lisbeth
authors.initials: L
authors.lastname: Regeur
authors.forename: Håvard
authors.initials: H
authors.lastname: Skeidsvoll
authors.forename: Inger Hilde
authors.initials: IH
authors.lastname: Nordhus
authors.forename: Ståle
authors.initials: S
authors.lastname: Pallesen
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D003710:Demography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance / Q000379:methods; D015995:Prevalence; D012148:Restless Legs Syndrome / Q000175:diagnosis / Q000453:epidemiology* / Q000503:physiopathology; D012307:Risk Factors; D012537:Scandinavian and Nordic Countries / Q000453:epidemiology; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires