title: Sleep quality in patients with fibromyalgia using the Pittsburgh Sleep Quality Index.
abstract: OBJECTIVE
  To characterize and quantify the sleep complaints of patients with fibromyalgia (FM) using the Pittsburgh Sleep Quality Index (PSQI).
  
  
  METHODS
  The PSQI was applied to 30 patients with FM according to American College of Rheumatology classification criteria and to 30 healthy controls in individual sessions under similar conditions.
  
  
  RESULTS
  The median global PSQI scores were [median (25-75%)] 12.0 (10-16) and 3.0 (2.0-5.0) in patients with FM and controls, respectively (p < 0.001). All PSQI component scores except sleep medications were significantly higher in patients than controls. Sleep latency, sleep disturbances, and daytime dysfunction were the most frequent sleep difficulties experienced by patients with FM.
  
  
  CONCLUSIONS
  Our results indicate that the PSQI is a useful instrument for characterizing and quantifying sleep disturbances in patients with FM.
authors.affiliation: Division of Rheumatology and the Sleep Laboratory, Heart Institute, Department of Internal Medicine, Hospital das Clínicas, Faculdade de Medicina, University of São Paulo, Brazil.
authors.forename: Cibele D
authors.initials: CD
authors.lastname: Osorio
authors.forename: Andréa L
authors.initials: AL
authors.lastname: Gallinaro
authors.forename: Geraldo
authors.initials: G
authors.lastname: Lorenzi-Filho
authors.forename: Lais V
authors.initials: LV
authors.lastname: Lage
mesh_terms: D005260:Female; D005356:Fibromyalgia / Q000145:classification / Q000150:complications* / Q000175:diagnosis*; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012893:Sleep Wake Disorders / Q000145:classification / Q000175:diagnosis* / Q000209:etiology*; D011795:Surveys and Questionnaires