Clinical Research Directory

Inclusion Criteria: * Adults aged 18 years and older * Diagnosis of COPD confirmed according to GOLD criteria * Clinically stable disease (no acute exacerbation or hospitalization within the last 4 weeks) * Ability to read and understand Turkish * Willingness to participate and provide written informed consent Exclusion Criteria: * Acute COPD exacerbation or respiratory infection within the previous 4 weeks * Presence of severe cardiac, neurological, or systemic disease affecting questionnaire responses * Coexisting pulmonary conditions such as bronchiectasis, lung cancer, prior pulmonary tuberculosis, pleural disease, or history of lung surgery * Moderate to severe cognitive impairment or communication difficulties * Severe visual or hearing impairment preventing questionnaire completion * Pregnancy * Refusal to participate or withdrawal during the study