Thomas Radulesco1, Julien Mancini2, Martin Penicaud3, Jean-Jacques Grob4, Marie-Aleth Richard5, Patrick Dessi3, Nausicaa Malissen4, Justin Michel6. 1. Aix Marseille Univ, APHM, IUSTI, Department of Oto-Rhino-Laryngology and Head and Neck Surgery, La Conception University Hospital, Marseille, France. Thomas.radulesco@ap-hm.fr. 2. Department of Public Health (BIOSTIC), Aix-Marseille Univ, INSERM, IRD, APHM, UMR1252, SESSTIM, Aix-Marseille University, Hôpital de la Timone, Marseille, France. 3. APHM, Department of Oto-Rhino-Laryngology and Head and Neck Surgery, La Conception University Hospital, 13385, Marseille Cedex, France. 4. Department of Dermatology and Skin Cancer, INSERM, CRCM, APHM, CHU Timone, Aix Marseille University, Marseille, France. 5. Dermatology Department, CEReSS-EA 3279, Research Centrer in Health Services and Quality of Life Aix Marseille University, Universitary Hospital Timone, Assistance Publique Hôpitaux de Marseille, APHM, 13385, Marseille, France. 6. Aix Marseille Univ, APHM, IUSTI, Department of Oto-Rhino-Laryngology and Head and Neck Surgery, La Conception University Hospital, Marseille, France.
Abstract
PURPOSE: Most questionnaires designed to evaluate patient-reported outcomes regarding scarring are available in English. The objective was to generate a validated French version of the SCAR-Q questionnaire. METHODS: The SCAR-Q questionnaire (including Appearance, Symptom and Psychological impact scales) was translated into French using a translation-back-translation process in accordance with international guidelines (ISPOR and WHO). For validation, two hundred patients consulting in our tertiary center completed the questionnaire. We tested scale reliability (Cronbach's α), floor/ceiling effects and item redundancy (inter-item correlations). Structural validity was tested using confirmatory factor analysis (CFA) with the robust weighted least squares (WLSMV) estimator and Delta parameterization. Model fit was examined using the root mean square error of approximation (RMSEA), the comparative fit index (CFI) and the Tucker-Lewis index (TLI). Correlations between scales and scale repeatability were tested (Spearman coefficient, Intra-class-coefficient). RESULTS: Four steps were required to obtain a translation consistent with the original version. Two hundred patients completed the questionnaire for validation. Internal consistency analysis found Cronbach's alphas > 0.7 for all scales (0.90 < α < 0.97). No floor or ceiling effect was found for all items (max = 85%). A ceiling effect was observed for all scales. Appearance and psychosocial impact scale items showed redundancy, with many inter-item correlations above 0.7. The CFA of the original structure displayed a reasonable fit, with RMSEA = 0.065, CFI = 0.974 and TLI = 0.972. Scales were positively correlated (0.45 < ρ < 0.65; p < 0.001). Test-retest intra-class correlation coefficients ranged from 0.94 to 0.99 for all scales. CONCLUSION: A French version of the SCAR-Q questionnaire is validated, ready for use.
PURPOSE: Most questionnaires designed to evaluate patient-reported outcomes regarding scarring are available in English. The objective was to generate a validated French version of the SCAR-Q questionnaire. METHODS: The SCAR-Q questionnaire (including Appearance, Symptom and Psychological impact scales) was translated into French using a translation-back-translation process in accordance with international guidelines (ISPOR and WHO). For validation, two hundred patients consulting in our tertiary center completed the questionnaire. We tested scale reliability (Cronbach's α), floor/ceiling effects and item redundancy (inter-item correlations). Structural validity was tested using confirmatory factor analysis (CFA) with the robust weighted least squares (WLSMV) estimator and Delta parameterization. Model fit was examined using the root mean square error of approximation (RMSEA), the comparative fit index (CFI) and the Tucker-Lewis index (TLI). Correlations between scales and scale repeatability were tested (Spearman coefficient, Intra-class-coefficient). RESULTS: Four steps were required to obtain a translation consistent with the original version. Two hundred patients completed the questionnaire for validation. Internal consistency analysis found Cronbach's alphas > 0.7 for all scales (0.90 < α < 0.97). No floor or ceiling effect was found for all items (max = 85%). A ceiling effect was observed for all scales. Appearance and psychosocial impact scale items showed redundancy, with many inter-item correlations above 0.7. The CFA of the original structure displayed a reasonable fit, with RMSEA = 0.065, CFI = 0.974 and TLI = 0.972. Scales were positively correlated (0.45 < ρ < 0.65; p < 0.001). Test-retest intra-class correlation coefficients ranged from 0.94 to 0.99 for all scales. CONCLUSION: A French version of the SCAR-Q questionnaire is validated, ready for use.
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