title: Validation of the Modified Fatigue Impact Scale in mild to moderate traumatic brain injury.
abstract: OBJECTIVE
  To evaluate the validity of the Modified Fatigue Impact Scale (MFIS) in veterans with a history of mild to moderate traumatic brain injury (TBI).
  
  
  METHODS
  Veterans (N = 106) with mild (92%) or moderate (8%) TBI.
  
  
  METHODS
  Veterans Administration Health System.
  
  
  METHODS
  Factor structure, internal consistency, convergent validity, sensitivity, and specificity of the MFIS were examined.
  
  
  RESULTS
  Principal component analysis identified 2 viable MFIS factors: a Cognitive subscale and a Physical/Activities subscale. Item analysis revealed high internal consistency of the MFIS Total scale and subscale items. Strong convergent validity of the MFIS scales was established with 2 Beck Depression Inventory II fatigue items. Receiver operating characteristic curve analysis revealed good to excellent accuracy of the MFIS in classifying fatigued versus nonfatigued individuals.
  
  
  CONCLUSIONS
  The MFIS is a valid multidimensional measure that can be used to evaluate the impact of fatigue on cognitive and physical functioning in individuals with mild to moderate TBI. The psychometric properties of the MFIS make it useful for evaluating fatigue and provide the potential for improving research on fatigue in this population.
authors.affiliation: Veterans Affairs San Diego Healthcare System (VASDHS), San Diego, California (Drs Schiehser, Delano-Wood, Jak, Matthews, Jacobson, Filoteo, Bondi, and Liu); Departments of Psychiatry (Drs Schiehser, Delano-Wood, Jak, Matthews, Simmons, Jacobson, Filoteo, Bondi, and Orff) and Family and Preventive Medicine (Dr Liu), School of Medicine, University of California San Diego, La Jolla; and Center of Excellence for Stress and Mental Health, VASDHS, San Diego, California (Dr Delano-Wood, Matthews, Simmons, Bondi, and Orff).
authors.forename: Dawn M
authors.initials: DM
authors.lastname: Schiehser
authors.forename: Lisa
authors.initials: L
authors.lastname: Delano-Wood
authors.forename: Amy J
authors.initials: AJ
authors.lastname: Jak
authors.forename: Scott C
authors.initials: SC
authors.lastname: Matthews
authors.forename: Alan N
authors.initials: AN
authors.lastname: Simmons
authors.forename: Mark W
authors.initials: MW
authors.lastname: Jacobson
authors.forename: J Vincent
authors.initials: JV
authors.lastname: Filoteo
authors.forename: Mark W
authors.initials: MW
authors.lastname: Bondi
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Orff
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D001930:Brain Injuries / Q000150:complications* / Q000523:psychology*; D005221:Fatigue / Q000175:diagnosis* / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D025341:Principal Component Analysis; D011594:Psychometrics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires; D014728:Veterans; D055815:Young Adult