A Clinical Validation Study to Evaluate the Diagnostic Accuracy of a Cough-based Auxiliary Diagnosis Algorithm for COPD

Inclusion Criteria: * patients with stable COPD were recruited for this study. Inclusion criteria were age ≥40 years and a diagnosis of COPD Exclusion Criteria: * Exclusion criteria were acute exacerbations of respiratory symptoms within the past 2 weeks or significant comorbid cardiovascular, neurological, musculoskeletal, immunological, or infectious diseases.