title: Assessment of fatigue among working people: a comparison of six questionnaires.
abstract: OBJECTIVE
  To compare the psychometric qualities of six fatigue questionnaires in a sample of working persons.
  
  
  METHODS
  Internal consistency and test-retest reliability, content validity, convergent validity, and the dimensionality of the fatigue instruments were explored.
  
  
  RESULTS
  All scales had a satisfactory internal consistency. Furthermore, based on factor analyses and Mokken scale analyses, all scales were unidimensional and appeared to measure an identical construct. The Fatigue Assessment Scale (FAS) had the highest factor loading on the one factor solution obtained in a factor analysis of the total scores of all scales.
  
  
  CONCLUSIONS
  All the questionnaires were unidimensional and had good reliability and validity. The FAS was the most promising fatigue measure.
authors.affiliation: Department of Psychology and Health, Tilburg University, and Research Institute for Psychology and Health, Netherlands. j.devries@uvt.nl
authors.forename: J
authors.initials: J
authors.lastname: De Vries
authors.forename: H J
authors.initials: HJ
authors.lastname: Michielsen
authors.forename: G L
authors.initials: GL
authors.lastname: Van Heck
mesh_terms: D000328:Adult; D005163:Factor Analysis, Statistical; D005221:Fatigue / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000209:etiology*; D016272:Occupational Health / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*