Tradução, adaptação transcultural e avaliação das propriedades psicométricas do Inflammatory Bowel Disease-Fatigue Patient Self-Assessment Scale (IBD-F): IBD-F Brasil

Abstract

Background: Fatigue is a common complaint in patients with inflammatory bowel diseases (IBD). Therefore, it is necessary for these patients a translated, culturally adapted and clinically tested instrument that evaluates fatigue. Objective: To translate and cross-culturally adapt the inflammatory Bowel Disease Fatigue Scale (IBD-F) into Brazilian-Portuguese and to test its measurement properties in Brazilian patients with IBD. Methods: The original version of the IBD-F was translated and cross-culturally adapted following the recommendations of the Guidelines for the process of cross-cultural adaptation of self-report measures. In addition to IBD-F, fatigue was assessed using the Functional Assessment of Chronic Illness Therapy-Fatigue (Facit-F) and the Hospital Anxiety and Depression Scale (HADS) was also used. The psychometric properties tested were: ceiling and floor effect, internal consistency, reproducibility (reliability and agreement), construct validity, internal and external responsiveness. Results: During the translation and cross-culturally adaptation phase, 40 patients participated in the study. During the test of psychometric properties, a total of 118 with IBD completed the research. The Brazilian-Portuguese version of IBD-F (IBD-F Brazil) showed good measurement properties with a Cronbach’s alpha of 0.95, an intraclass correlation coefficient of 0.97, a standard error of measurement of 4.8 points, and minimal detectable change of 6.0 points. We detected 25% of floor effects, with no ceiling effect. The construct validity analysis observed a good inverse correlation between the IBD-F and Facit-F (r=- 0.46). Effect sizes used for measuring internal responsiveness ranged from moderate for CD to low for UC. The IBD-F was a measure with high external responsiveness for CD and with low external responsiveness for UC. Area under the curve was 0.95 being considered responsive. Conclusions: The Brazilian-Portuguese version of IBD-F has adequate measurement properties and can be used in clinical practice and research.