Patients classification with the GOLD 2011 staging system
GOLD 2011
n
GOLD 2010(%): I/II/III/IV
A
28
39.2/60.8/0/0
B
29
31/69/0/0
C
14
7.2/35.7/57.1/0
D
57
1.8/17.5/47.4/33.3