Lim JU, et al. – The aim of the present investigation was to evaluate patients with COPD among different body mass index (BMI) categories according to two BMI classification systems: WHO and Asia–Pacific. Findings revealed that patients with COPD who have a high BMI have better pulmonary function and health–related quality of life and decreased dyspnea symptoms. The Asia–Pacific BMI classification more appropriately reflects the association of obesity and disease manifestation in Asian COPD patients than the WHO classification.