Article

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 alpha. 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 (rho). 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
alpha 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 (rho 0.93) and was confirmed by Bland and Altman analysis; most items
(12/18) had kappa values from 0.61 to 0.80. CONCLUSION: 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.
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Langue : ANGLAIS