Course of COPD assessment test (CAT) and clinical COPD questionnaire (CCQ) scores during recovery fr
direction (from stable state to exacerbation) MacKay et al. [19] noted a change from 19.4 to 24.1 points in the CAT score in a population of outpatients with COPD. This change was smaller in magnitude to the one observed in our study, but the health statu...