Fig. 4

Quality of life assessment. a Saint George’s Respiratory Questionnaire (SGRQ-C) and b COPD assessment test (CAT) for the 29 W group (Open Bars), 32 W Group (hashed bars), and 32 W confirmation group (32 W-CFM; solid gray bars) at baseline, 1, 2, and 3 years. Values are mean ± SD. Combined values, “All”, are depicted as the red line. P < 0.05 for combined values compared with baseline is denoted by *