title: French adaptation and validation of the Osteoarthritis Quality of Life scale.
abstract: OBJECTIVE
  The Osteoarthritis Quality of Life scale (OAQoL) is an osteoarthritis-specific measure developed in the United Kingdom by a needs-based approach. This study describes the adaptation and validation of this English scale into French.
  
  
  METHODS
  The OAQoL was translated into French by a dual-panel technique followed by cognitive debriefing interviews. Internal consistency was assessed by the Cronbach α. Construct validity was tested by exploratory and confirmatory factor analyses and by convergent and divergent correlations with other patient-reported outcome measures by the Spearman rho (ρ). Reliability was explored by Spearman rho as well as the Bland and Altman method for the total score and Cohen's kappa for each item score.
  
  
  RESULTS
  Cognitive debriefing revealed the French OAQoL to be clear, relevant and comprehensive. The Cronbach α was 0.91. Exploratory factor analysis extracted 4 groups of items. After eliminating 4 items, confirmatory factor analysis of the remaining 18 items confirmed higher intra-factor than inter-factor correlations. The expected convergent and divergent correlations were observed. Test-retest reliability was good (ρ 0.93) and was confirmed by Bland and Altman analysis; most items (12/18) had kappa values from 0.61 to 0.80.
  
  
  CONCLUSIONS
  The French OAQoL is an easy-to-use 18-item questionnaire with good content and construct validity to assess the impact of osteoarthritis on quality of life for French-speaking patients.
authors.affiliation: Inserm U1153, université Paris Descartes, hôpital Cochin, AP-HP, 75619 Paris, France. Electronic address: gaelle.couraud2@gmail.com.
authors.forename: G
authors.initials: G
authors.lastname: Couraud
authors.affiliation: Inserm U1153, université Paris Descartes, hôpital Cochin, AP-HP, 75619 Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Escalas
authors.affiliation: Inserm U1153, université Paris Descartes, hôpital Cochin, AP-HP, 75619 Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Etcheto
authors.affiliation: Inserm U1153, université Paris Descartes, hôpital Cochin, AP-HP, 75619 Paris, France.
authors.forename: F
authors.initials: F
authors.lastname: Rannou
authors.affiliation: Inserm U1153, université Paris Descartes, hôpital Cochin, AP-HP, 75619 Paris, France. Electronic address: serge.poiraudeau@cch.aphp.fr.
authors.forename: S
authors.initials: S
authors.lastname: Poiraudeau
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005163:Factor Analysis, Statistical; D005260:Female; D005602:France; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000503:physiopathology* / Q000523:psychology*; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014175:Translating
keywords: Cross-cultural adaptation; Needs-based approach; Osteoarthritis; Quality of life; Questionnaire