Epidemiology study in patients with Chronic Obstructive Pulmonary Disease (COPD) in Korea - EPOCH

This study is planned to evaluate 2 years of exacerbation in COPD patients and to investigate correlation of COPD disease progress and its exacerbation.

This study was designed as a multicenter, prospective and retrospective and descriptive epidemiology study.This study consisted of 6 months of patient enrollment, 12 months of retrospective study, and 12 months of prospective study. Hence, each patient will be participating in the study for 12 months, while the actual data collections from the patients will take a total of 24 months. The statistical analysis of this study will be done twice, at the completion of 1 year retrospective data collection and at the completion of next 1 year follow-up.