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Patterns and determinants of COPD-related healthcare utilization by severity of airway obstruction in Korea
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We investigated patients with chronic obstructive pulmonary disease (COPD) to analyze patterns and identify determinants of healthcare use, according to the severity of airflow obstruction. We used retrospective cohort data from a combination of the 4th Korea National Health and Nutritional Examination Survey (KNHANES) and Korean National Health Insurance (NHI) claims. |