title: The Spanish version of the FibroFatigue Scale: validation of a questionnaire for the observer's assessment of fibromyalgia and chronic fatigue syndrome.
abstract: OBJECTIVE
  To examine some of the psychometric properties of the Spanish version of the FibroFatigue Scale (FFS).
  
  
  METHODS
  FFS was administered to 120 patients diagnosed with fibromyalgia and chronic fatigue syndrome. Internal consistency was evaluated by using Cronbach's alpha, test-retest reliability with weighted kappa and construct validity by correlations among FFS, the Fibromyalgia Impact Questionnaire (FIQ), the EuroQol 5D (EQ-5D) and the Hospital Anxiety and Depression Scale (HADS). The interrater reliability was tested using analysis of variance with patients and raters as independent factors.
  
  
  RESULTS
  Internal consistency (alpha) was .88, test-retest reliability was .91, and interrater reliability was .93. Significant correlations were obtained between overall FFS and the FIQ (.55, P<.01), the EQ-5D (-.48, P<.01) and the HADS depression subscale (.25, P<.01), but not with the HADS anxiety subscale.
  
  
  CONCLUSIONS
  These results support the reliability and validity of the data obtained with the Spanish version of the FSS.
authors.affiliation: Department of Psychiatry, Miguel Servet University Hospital and University of Zaragoza Faculty of Medicine, Avenida Isabel La Católica, s/n 50.009 Zaragoza, Spain. jgarcamp@arrakis.es
authors.forename: Javier
authors.initials: J
authors.lastname: García-Campayo
authors.forename: Aída
authors.initials: A
authors.lastname: Pascual
authors.forename: Marta
authors.initials: M
authors.lastname: Alda
authors.forename: Jesús
authors.initials: J
authors.lastname: Marzo
authors.forename: Rosa
authors.initials: R
authors.lastname: Magallon
authors.forename: Sandra
authors.initials: S
authors.lastname: Fortes
mesh_terms: D000328:Adult; D015673:Fatigue Syndrome, Chronic / Q000175:diagnosis*; D005260:Female; D005356:Fibromyalgia / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D013030:Spain; D011795:Surveys and Questionnaires