Chinese version of the chronic urticaria quality of life questionnaire: cultural adaptation, factor analysis, assessment of reliability and validity.

Chronic urticaria is a common skin disorder that contributes profound impact on patients' quality of life (QoL). However, the cause of the disease is not clear, and the treatment still faces challenges. To better evaluate the effectiveness of treatment, an effective questionnaire survey on quality of life is needed. For the first time in Italy, a new questionnaire for chronic spontaneous urticaria, the chronic urticaria quality of life questionnaire (CU-Q2oL), has been developed. The purpose of this study was to develop and verify the Chinese version of the chronic urticaria quality of life questionnaire (CU-Q2oL). Three hundred and twenty-eight chronic urticaria patients were prospectively recruited and evaluated by the translated Chinese version of CU-Q2oL along with the Dermatology Life Quality Index (DLQI). Factor analysis, internal consistency, convergent validity, sensitivity to change and known-group validity were determined. Multiple linear regressions were used to determine the predicting factors of CU-Q2oL results. Factor analysis revealed a six-dimensional structure, and five of the six scales showed good internal consistency. Convergent validity and know-group validity showed good correlations. It was found to distinguish well between patients with different levels of urticaria activity and those to be sensitive to change in the Chinese CU-Q2oL. Disease severity was highly significantly predictive of the CU-Q2oL score on all scales. The CU-Q2oL Chinese version is a valid, reliable and sensitive instrument. It can be widely adopted to evaluate treatment outcomes and be applied in clinical research in Chinese patients.