Small Airway Dysfunction in Chronic Bronchitis with Preserved Pulmonary Function

Figure 1

Patient selection. Totally, 862 patients were enrolled. 5 patients who rehospitalization during 2014–2017; 289 patients who defined as GOLD grades 3 and 4; and 225 patients who exhibited comorbidities and/or data missing were excluded. Complete data were available for 157 CB and 186 COPD patients.