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.


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.


1


Introduction


Osteoarthritis (OA) is a frequent disease worldwide with an important impact on patient disability and quality of life (QOL) . It is the most frequent musculoskeletal disease and affects 10% of the global population older than 60 years old . OA has been ranked the 11th cause of years lived with disability in the 2010 World Health Organization (WHO) global burden of diseases study .


QOL encompasses social, psychological and spiritual well-being of the person and how these aspects interact with the person’s environment. The WHO researchers define QOL as “the perception of the individual of their position in life in the context of the culture and value systems in which they live in relation to their goals, expectations, standards and concerns.” Consequences of disease and its treatments on QoL are represented by health-related quality of life. QoL is also affected by personality, economic status, education level, environment, liberty, social integration, and demographics ( Fig. 1 ).


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Apr 20, 2017 | Posted by in PHYSICAL MEDICINE & REHABILITATION | Comments Off on French adaptation and validation of the Osteoarthritis Quality of Life scale

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