Table 1: Anthropometric, Basic Pulmonary Function, and Demographic Data of the Study Sample

Variable (N=70) GOLD 2 GOLD 3 (N=65)
Sex              Male 57 54
Age              yrs 64.3           (10.2) 64.7           (8.3)
BMI             kg/m2 26.5           (3.8) 24.8           (4.0)
IVC             %pred 94.5           (15.2) 90.1           (14.2)
FEV1             %pred 61.0           (7.1) 40.9           (5.2)
Tiffeneau           %pred 50.0           (8.0) 35.0           (8.0)
TLC             %pred 100.9           (16.6) 106.0           (14.7)
TLCO             %pred 73.7           (21.5) 59.4           (22.3)
PaO2 rest, kPa 11.1           (1.3) 10.6           (1.3)
PaCO2rest, kPa 5.1            (0.5) 5.2            (0.5)
Smoking status
  current smoking
  quit
22
48
18
47
Self-reported COPD diagnosis, yrs.
    < 1yr.
    1 − 10 yrs.
    > 10 yrs.
12
28
30
5
30
30

Note: BMI= body mass index; IVC %pred= inspiratory vital capacity as percentage of predicted; FEV1 %pred= forced expiratory volume in one second as percentage of predicted; Tiffeneau %pred= FEV1/IVC as percentage of predicted. TLC %pred= total lung capacity as percentage of predicted; TLCO %pred= lung transfer capacity for carbon monoxide as percentage of predicted. Data are presented as N, or mean (SD).