title: The relation between pathological worrying and fatigue in a working population.
abstract: OBJECTIVE
  This study aimed to explore cross-sectional and longitudinal associations between pathological worry and fatigue in a working population.
  
  
  METHODS
  In employees with very low or very high fatigue levels, psychometrics of the Penn State Worry Questionnaire (PSWQ; measuring pathological worry) and the Checklist Individual Strength (CIS; measuring fatigue) were examined and their cross-sectional and longitudinal associations were explored.
  
  
  RESULTS
  Pathological worry and fatigue can be measured as different constructs. However, pathological worry and fatigue were also associated on a cross-sectional level. Pathological worry predicted fatigue level 10 months later, but this association disappeared after adjustment for the cross-sectional association between pathological worry and fatigue.
  
  
  CONCLUSIONS
  Although they can be measured as different constructs, pathological worry and fatigue seem to be associated. When studying longitudinal relations between pathological worry and fatigue, their cross-sectional association should be taken into account. Pathological worry might not be a risk factor for fatigue per se, but might act more like a mediating factor.
authors.affiliation: Department of General Practice, Maastricht University, Maastricht, The Netherlands. helene.andrea@deviersprong.nl
authors.forename: H
authors.initials: H
authors.lastname: Andrea
authors.forename: A J H M
authors.initials: AJ
authors.lastname: Beurskens
authors.forename: Ij
authors.initials: I
authors.lastname: Kant
authors.forename: G C L
authors.initials: GC
authors.lastname: Davey
authors.forename: A P
authors.initials: AP
authors.lastname: Field
authors.forename: C P
authors.initials: CP
authors.lastname: van Schayck
mesh_terms: D000328:Adult; D001008:Anxiety Disorders / Q000453:epidemiology* / Q000523:psychology; D015331:Cohort Studies; D015897:Comorbidity; D003430:Cross-Sectional Studies; D005221:Fatigue / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D009784:Occupational Diseases / Q000453:epidemiology* / Q000523:psychology; D010555:Personality Inventory / Q000706:statistics & numerical data; D011446:Prospective Studies; D011594:Psychometrics; D012307:Risk Factors; D013223:Statistics as Topic