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The prevalence and effects of airway diseases, including asthma, eosinophilic bronchitis (E, chronic obstructive pulmonary disease (COPD), and asthma-COPD overlap (ACO) have not been thoroughly studied in patients with idiopathic pulmonary fibrosis (IPF). This study aimed to evaluate the prevalence of airway diseases in patients with IPF and to identify the differences in symptoms based on the presence of airway diseases. This single-institution prospective cohort study was conducted from June 2017 to September 2018, at the Seoul Nat