Data are mean ± SD, median [25–75 interquartile], or number (percentage). COPD: chronic obstructive pulmonary disease; CIRS: cumulative illness rating scale;a : defined as body mass index >30 kg.m−2;b
Binary variables were marked by * with occurrence and incidence rate reported. Continuous variables were reported with median value and IQR. Variables with different mean values in these two populatio