ORIGINAL ARTICLE Adaptation and Validation of the Spanish Version of the Chronic Urticaria Quality of Life Questionnaire (CU-Q2oL)

Objectives: The aim of this study was to develop a Spanish version of the Chronic Urticaria Quality of Life Questionnaire (CU-Q2oL) and to test its acceptability, reliability, validity, and sensitivity to change. Methods: Forward and back translation by bilingual translators followed by pilot testing in patients with urticaria was used to adapt the questionnaire. The Spanish version of the CU-Q2oL was self-administered alongside the Skindex-29 in an observational, longitudinal, multicenter study. Feasibility was assessed by analyzing missing responses and ceiling and fl oor effects. Reliability was tested by examining internal consistency (Cronbach α). Construct validity was analyzed by examining convergent and discriminant validity with the Skindex-29 and by evaluating the ability of the CU-Q2oL to discriminate between patients according to a clinical classifi cation of severity. Sensitivity to change was analyzed in a subgroup of patients who completed a second visit 4 weeks after baseline. Results: A total of 695 patients were included in the analysis. Mean (SD) age was 42.4 (15.0) years and 62.1 % of the sample was female. All of the items on the CU-Q2oL were answered by 91.9 % of the sample. Over 15 % of patients scored at the fl oor (best possibl