title: A new validation of the Spanish Work Productivity and Activity Impairment Questionnaire-Crohn's disease version.
abstract: OBJECTIVE
  The Work Productivity and Activity Impairment Questionnaire (WPAI) is an instrument that measures work impairment in the setting of different diseases. One previous study validating the WPAI in Crohn's disease (CD) patients suggested that its reproducibility may be unsatisfactory. This study evaluated the validity and reproducibility of the Spain Spanish version of the WPAI questionnaire in CD patients.
  
  
  METHODS
  In a prospective study, convergent validity was tested comparing WPAI with quality of life and CD activity indices. Known-groups validity was assessed by comparing WPAI scores in CD patients with active versus inactive disease. Reproducibility of repeated tests was evaluated by comparing two WPAI measures obtained two to four weeks apart in stable patients.
  
  
  RESULTS
  One hundred eight patients were included in the various steps of the analysis. The WPAI showed adequate known groups validity and convergent validity. The reproducibility of the test and, specifically, that of the evaluation of presenteeism (the impairment of productivity while working) were good.
  
  
  CONCLUSIONS
  This study confirms the validity of WPAI for measuring work impairment in CD patients. In contrast to previous studies, the test reproducibility was adequate.
authors.affiliation: Digestive Disease Unit, Hospital de Sabadell, Institut Universitari Parc Taulí, Universitat Autònoma de Barcelona, Sabadell, Spain.
authors.forename: Mercedes
authors.initials: M
authors.lastname: Vergara
authors.forename: Antònia
authors.initials: A
authors.lastname: Montserrat
authors.forename: Francesc
authors.initials: F
authors.lastname: Casellas
authors.forename: Albert
authors.initials: A
authors.lastname: Villoria
authors.forename: David
authors.initials: D
authors.lastname: Suarez
authors.forename: Michael
authors.initials: M
authors.lastname: Maudsley
authors.forename: Olga
authors.initials: O
authors.lastname: Gallardo
authors.forename: Elena
authors.initials: E
authors.lastname: Ricart
authors.forename: Xavier
authors.initials: X
authors.lastname: Calvet
mesh_terms: D000041:Absenteeism; D000328:Adult; D003424:Crohn Disease / Q000503:physiopathology / Q000523:psychology*; D004522:Educational Status; D004526:Efficiency; D005260:Female; D006801:Humans; D008297:Male; D011446:Prospective Studies; D011788:Quality of Life; D015203:Reproducibility of Results; D013030:Spain; D011795:Surveys and Questionnaires