title: Multidimensional Fatigue Inventory: Spanish adaptation and psychometric properties for fibromyalgia patients. The Al-Andalus study.
abstract: OBJECTIVE
  The aim of this study was to assess the psychometric properties and transcultural adaptation into Spanish of the Multidimensional Fatigue Inventory in fibromyalgia patients.
  
  
  METHODS
  The Spanish version of the Multidimensional Fatigue Inventory (MFI-S) was translated and cognitively pretested following cross-cultural adaptation guidelines. Test-retest reliability, convergent validity, and operational qualities were evaluated in a total of 116 fibromyalgia patients. Convergent validity was assessed comparing MFI-S with a visual analogue scale for global fatigue.
  
  
  RESULTS
  The intra-class correlation coefficients varied from moderate to excellent (from 0.64 to 0.91) and the standard errors of the mean ranged from 0.5 to 1.1 points for the five MFI-S domains. The coefficient of repeatability was less than 2 standard deviations and the limits of agreement ranged from 2 to 4 points for the MFI-S domains. A weak to fair significant relationship was found between each MFI-S domain and the visual analogue scale (from 0.21 to 0.32). The mean time required to complete the MFI-S was 3.2±2.0 minutes. None of the patients needed external help to complete the MFI-S, and there were very few missing values.
  
  
  CONCLUSIONS
  The MFI-S developed in this study presents a good reliability and reasonable construct validity for Spanish fibromyalgia patients unaffected by cognitive dysfunction and severe depression. This questionnaire is quick, easy to administer and interpret.
authors.affiliation: Section of Physical Education and Sports, University Pablo de Olavide, Seville, Spain. dmunizq@upo.es
authors.forename: Diego
authors.initials: D
authors.lastname: Munguía-Izquierdo
authors.forename: Victor
authors.initials: V
authors.lastname: Segura-Jiménez
authors.forename: Daniel
authors.initials: D
authors.lastname: Camiletti-Moirón
authors.forename: Manuel
authors.initials: M
authors.lastname: Pulido-Martos
authors.forename: Inmaculada C
authors.initials: IC
authors.lastname: Alvarez-Gallardo
authors.forename: Alejandro
authors.initials: A
authors.lastname: Romero
authors.forename: Virginia A
authors.initials: VA
authors.lastname: Aparicio
authors.forename: Ana
authors.initials: A
authors.lastname: Carbonell-Baeza
authors.forename: Manuel
authors.initials: M
authors.lastname: Delgado-Fernández
mesh_terms: D003466:Cultural Characteristics; D005221:Fatigue / Q000175:diagnosis* / Q000209:etiology / Q000523:psychology; D005260:Female; D005356:Fibromyalgia / Q000150:complications / Q000175:diagnosis* / Q000523:psychology; D006801:Humans; D007802:Language; D008875:Middle Aged; D011237:Predictive Value of Tests; D011594:Psychometrics; D012044:Regression Analysis; D015203:Reproducibility of Results; D013030:Spain; D011795:Surveys and Questionnaires; D014175:Translating