Respirology : official journal of the Asian Pacific Society of Respirology
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A well-validated instrument that is simple to use is needed to assess health-related quality of life in patients with interstitial lung disease (ILD). The COPD assessment test (CAT) is a recently introduced, short and simple questionnaire for COPD patients, which shows good and valid measurement properties. This study was conducted to evaluate the validity of the CAT in patients with ILD. ⋯ The CAT is a short and simple questionnaire that shows good and valid measurement properties for assessing the health status of patients with ILD.