OBJECTIVE: The aim of this study was to adapt the Rheumatoid Arthritis Quality of Life (RAQoL) questionnaire for use in Turkey and to test its reliability and validity. METHODS: The translation process included the recent guidelines for cross-cultural adaptation. Reliability of the Turkish RAQoL was assessed by internal consistency and test-retest reliability, internal construct validity by Rasch analysis, and external construct validity by associations with impairments, disability, and general health status. Cross-cultural validity was tested through analysis of differential item functioning (DIF) by comparison with data from the UK version of the RAQoL. RESULTS: Reliability of the adapted version was good, with high internal consistency (Cronbach's alpha 0.95 and 0.96 at times 1 and 2, respectively) and test-retest reliability (Spearman's rho 0.874). Internal construct validity was confirmed by excellent fit to the Rasch model (mean item fit 0.236, SD 1.113) and external construct validity by expected associations. The DIF for culture was found in four items. CONCLUSIONS: Adaptation of the RAQoL for use in Turkey was successful. The instrument can be used in both national and international studies for cross-cultural comparison with the UK, as long as adjustments are made for the few items displaying DIF for culture.
OBJECTIVE: The aim of this study was to adapt the Rheumatoid Arthritis Quality of Life (RAQoL) questionnaire for use in Turkey and to test its reliability and validity. METHODS: The translation process included the recent guidelines for cross-cultural adaptation. Reliability of the Turkish RAQoL was assessed by internal consistency and test-retest reliability, internal construct validity by Rasch analysis, and external construct validity by associations with impairments, disability, and general health status. Cross-cultural validity was tested through analysis of differential item functioning (DIF) by comparison with data from the UK version of the RAQoL. RESULTS: Reliability of the adapted version was good, with high internal consistency (Cronbach's alpha 0.95 and 0.96 at times 1 and 2, respectively) and test-retest reliability (Spearman's rho 0.874). Internal construct validity was confirmed by excellent fit to the Rasch model (mean item fit 0.236, SD 1.113) and external construct validity by expected associations. The DIF for culture was found in four items. CONCLUSIONS: Adaptation of the RAQoL for use in Turkey was successful. The instrument can be used in both national and international studies for cross-cultural comparison with the UK, as long as adjustments are made for the few items displaying DIF for culture.
Authors: Jeanette Wilburn; Stephen P McKenna; Şehim Kutlay; Tamas Bender; Jürgen Braun; Concepcion Castillo-Gallego; Marta Favero; Pal Geher; Uta Kiltz; Emilio Martin-Mola; Roberta Ramonda; Matthew Rouse; Alan Tennant; Ayşe A Küçükdeveci Journal: Rheumatol Int Date: 2017-02-15 Impact factor: 2.631
Authors: Christian A Waimann; Fernando M Dal Pra; Maria F Marengo; Emilce E Schneeberger; Susana Gagliardi; Jose A Maldonado Cocco; Mónica Sanchez; A Garone; Rafael E Chaparro del Moral; Oscar L Rillo; Mariana Salcedo; Javier E Rosa; F Ceballos; Enrique R Soriano; Gustavo Citera Journal: Clin Rheumatol Date: 2012-04-04 Impact factor: 2.980
Authors: Jeanette Wilburn; Stephen P McKenna; James Twiss; Matthew Rouse; Mariusz Korkosz; Roman Jancovic; Petr Nemec; César Francisco Pacheco-Tena; Alain Saraux; Rene Westhovens; Patrick Durez; Mona Martin; Marika Tammaru Journal: Rheumatol Int Date: 2014-10-01 Impact factor: 2.631