Inclusion and exclusion criteria
communication disorders or mental diseases, asthma, cystic fibrosis, respiratory diseases, allergies, COPD
RESPIRATORY DISEASE, BRONCHIECTASIS, COPD EXACERBATION, AIRWAY OBSTRUCTION, COPD, ACUTE RESPIRATORY INFECTION, CHRONIC OBSTRUCTIVE LUNG DISEASE, ALLERGIES
Inclusion criteria: (1) age between 40 and 75 years; (2) a diagnosis of COPD in accordance with the Global Initiative for Chronic Obstructive Lung Disease (GOLD) guidelines for at least 2 years [Patients with allergies to relevant drugs in this study, acute respiratory infection prior to admission, acute COPD exacerbation within 2 weeks, communication disorders or mental diseases, those who were unable to complete three BT sessions for various reasons, other respiratory diseases, such as asthma, cystic fibrosis, bronchiectasis, mechanical upper airway obstruction, and so on, and patients who did not consent to long-term follow-up or were diagnosed with another condition that limited life expectancy were excluded from the analysis.A complete list of the inclusion and exclusion criteria is provided in the Additional file 