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Evaluation of the COPD assessment test (CAT) for measuring health-related quality of life in patients with interstitial lung disease

There is a need for a short, simple, and well validated instrument to assess health-related quality of life (HRQL) in patients with interstitial lung disease (ILD). The study was conducted to evaluate the validity of the COPD assessment test (CAT), which is a newly developed short and simple questionnaire for COPD with good measurement properties, in ILD. 52 ILD patients completed the CAT and the St. George9s Respiratory Questionnaire (SGRQ). The patients also completed the MRC dyspnea scale, the Leicester Cough Questionnaire (LCQ), and the Hospital Anxiety and Depression Scale (HADS) and also underwent a six-minute walk test, pulmonary function tests, and arterial blood gas analysis. The correlation between the CAT score and the SGRQ total score was very strong (r=0.93, p p p p