title: A 5-year prospective cohort study on health-related quality of life in patients with narcolepsy.
abstract: OBJECTIVE
  To evaluate the 5-year variation of health-related quality of life (HRQoL) and mood symptoms in a cohort of patients with narcolepsy.
  
  
  METHODS
  Adults attending the Sleep Centre of the Department of Neurological Sciences, University of Bologna in 1997 and meeting the International Classification of Sleep Disorders-Revised criteria for the diagnosis of narcolepsy were eligible. Included patients self-administered the Medical Outcome Short Form-36 (SF-36) and the Zung depression scale (ZDS) prospectively in 1998 and 2003.
  
  
  RESULTS
  There was no significant difference between 1998 and 2003 measures of SF-36 and ZDS in the 54 patients included. About 25% of them showed moderate or severe mood symptoms in both observations. ZDS score (inversely) and duration of disease (directly) explained a percentage of variance of role physical, vitality (VT), social functioning (SF) and role emotional. At the second observation VT and SF had a further percentage of variance explained by excessive daytime sleepiness (EDS) and age at onset. Self-reported diabetes frequency doubled after 5 years (from 7% to 17%).
  
  
  CONCLUSIONS
  Patients with narcolepsy show a stable impairment of HRQoL in a 5-year period with respect to Italian normative data. Mood status and EDS negatively influence their HRQoL while disease duration has a positive influence.
authors.affiliation: Ambulatorio di Neurologia, Polo Sanitario Barberini di Crevalcore, AUSL di Bologna, Bologna, Italy. vigna@interfree.it
authors.forename: Luca
authors.initials: L
authors.lastname: Vignatelli
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Plazzi
authors.forename: Francesco
authors.initials: F
authors.lastname: Peschechera
authors.forename: Laureta
authors.initials: L
authors.lastname: Delaj
authors.forename: Roberto
authors.initials: R
authors.lastname: D'Alessandro
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000368:Aged; D005221:Fatigue / Q000523:psychology; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D009290:Narcolepsy / Q000523:psychology*; D011446:Prospective Studies; D011569:Psychiatric Status Rating Scales; D011788:Quality of Life; D012720:Severity of Illness Index; D012917:Social Adjustment; D011795:Surveys and Questionnaires; D055815:Young Adult