title: The Mini-OAKHQOL for knee and hip osteoarthritis quality of life was obtained following recent shortening guidelines.
abstract: OBJECTIVE
  To develop a short form of the knee and hip osteoarthritis quality of life questionnaire, the Mini-OAKHQOL, preserving the conceptual model and, as far as possible, the content and the psychometric properties of the original instrument.
  
  
  METHODS
  A two-step shortening procedure was used: (1) a consensus Delphi method, with a panel of patients and another of professionals independently asked to select items and (2) a nominal group, where patients, professionals, and methodologists reached consensus on the final selection of items, using information from the panels and from modern measurement and classical test theory analyses. The psychometric properties of the Mini-OAKHQOL were assessed in an independent population-based sample of 581 subjects with knee or hip osteoarthritis.
  
  
  RESULTS
  The two-step shortening procedure resulted in a 20-item questionnaire. Confirmatory factor analysis showed preservation of the original five-dimensional structure. Rasch analyses showed the unidimensionality and invariance by sex, age, and joint of the main dimensions. Convergent validity, reproducibility, and internal consistency were similar to or better than those of the original OAKHQOL.
  
  
  CONCLUSIONS
  The 20-item Mini-OAKHQOL has good psychometric properties and can be used for the measurement of quality of life in subjects with osteoarthritis of the lower limbs.
authors.affiliation: University of Lorraine, University Paris Descartes, EA 4360 Apemac, avenue de la Foret de Haye, Vandoeuvre-les-Nancy, France; Centre d'investigation clinique - Epidémiologie clinique CIC 1433 Institute national de la santé et de la recherche médicale, rue du Morvan, Vandoeuvre-les-Nancy, Nancy, France. Electronic address: francis.guillemin@univ-lorraine.fr.
authors.forename: Francis
authors.initials: F
authors.lastname: Guillemin
authors.affiliation: University of Lorraine, University Paris Descartes, EA 4360 Apemac, avenue de la Foret de Haye, Vandoeuvre-les-Nancy, France; Centre d'investigation clinique - Epidémiologie clinique CIC 1433 Institute national de la santé et de la recherche médicale, rue du Morvan, Vandoeuvre-les-Nancy, Nancy, France; Department of Rheumatology, CHU de Brabois, rue du Morvan, Vandoeuvre-les-Nancy, Nancy, France.
authors.forename: Anne-Christine
authors.initials: AC
authors.lastname: Rat
authors.affiliation: University of Lorraine, University Paris Descartes, EA 4360 Apemac, avenue de la Foret de Haye, Vandoeuvre-les-Nancy, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Goetz
authors.affiliation: University of Lorraine, University Paris Descartes, EA 4360 Apemac, avenue de la Foret de Haye, Vandoeuvre-les-Nancy, France.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Spitz
authors.affiliation: University of Lorraine, University Paris Descartes, EA 4360 Apemac, avenue de la Foret de Haye, Vandoeuvre-les-Nancy, France; Department of Internal Medicine, Assistance publique-Hôpitaux de Paris, Hôpital européen Georges Pompidou, rue Leblanc, Paris, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Pouchot
authors.affiliation: University of Lorraine, University Paris Descartes, EA 4360 Apemac, avenue de la Foret de Haye, Vandoeuvre-les-Nancy, France; Biostatistics and Epidemiology Unit, Assistance publique-Hôpitaux de Paris, Hôtel Dieu, place du Parvis Notre-Dame, Paris, France.
authors.forename: Joël
authors.initials: J
authors.lastname: Coste
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000175:diagnosis*; D020370:Osteoarthritis, Knee / Q000175:diagnosis*; D017410:Practice Guidelines as Topic; D011594:Psychometrics; D011788:Quality of Life; D011795:Surveys and Questionnaires
keywords: Hip; Knee; Osteoarthritis; Quality of life; Questionnaire; Rasch model; Short form