title: Fatigue among working people: validity of a questionnaire measure.
abstract: OBJECTIVE
  To evaluate the validity of the checklist individual strength questionnaire (CIS) in the working population. This 20 item self reported questionnaire has often been used in patients with chronic fatigue. To date, no research has focused on the validity of the CIS in occupational groups.
  
  
  METHODS
  To evaluate the discriminant validity the CIS was filled out by five groups of employees with expected differences in fatigue. The convergent validity was evaluated by comparing the results of the CIS with the results of three related measures: measured unidimensional fatigue, burnout, and need for recovery.
  
  
  RESULTS
  The CIS was able to discriminate between fatigued and non-fatigued employees in occupational groups. The expected agreement between the results of the CIS and related measures was confirmed.
  
  
  CONCLUSIONS
  The CIS seems to be an appropriate instrument for measuring fatigue in the working population.
authors.affiliation: Department of Epidemiology, Maastricht University, PO Box 616, 6200 MD Maastricht, The Netherlands.
authors.forename: A J
authors.initials: AJ
authors.lastname: Beurskens
authors.forename: U
authors.initials: U
authors.lastname: Bültmann
authors.forename: I
authors.initials: I
authors.lastname: Kant
authors.forename: J H
authors.initials: JH
authors.lastname: Vercoulen
authors.forename: G
authors.initials: G
authors.lastname: Bleijenberg
authors.forename: G M
authors.initials: GM
authors.lastname: Swaen
mesh_terms: D000328:Adult; D002055:Burnout, Professional; D015331:Cohort Studies; D004651:Employment / Q000523:psychology*; D005221:Fatigue / Q000453:epidemiology* / Q000523:psychology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D009426:Netherlands / Q000453:epidemiology; D011446:Prospective Studies; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires