Fig. 4From: Determinants of chronic obstructive pulmonary disease severity in the late-elderly differ from those in younger patientsTotal CAT scores of COPD patients aged <75 and ≥75 years with different GOLD grades of COPD. Gray columns <75 years old, black columns ≥75 years old. Data are presented as mean ± SD. *p < 0.05 between two different age groups. p < 0.0001 comparison between four GOLD grade groups of <75 years old, and †p < 0.05 by post hoc analysis between Grade IV vs. I, II, and III groupsBack to article page