6 MWT and PFT parameters

Class 1

30 - 34.9 kg/m²

Class 2

35 - 39.9 kg/m²

Class 3

≥40 kg/m²

P value

Distance walked-meters (mean)

n = 342

313.53

300.86

256.73

<0.01

% predicted distance on 6 MWT

n = 342

60.27

58.08

54.11

0.15

Total lung capacity (TLC %)

n = 263

87.11

85.92

81.92

0.17

Vital capacity (VC %)

n = 263

87.20

83.74

80.9

0.08

Functional residual capacity (FRC%)

n = 263

89.38

87.15

75.62

< 0.01

Residual volume (RV%)

n = 263

87.69

87.37

79.93

0.32

Diffusion capacity (DLCO%)

n = 257

57.57

63.49

66.70

<0.01

Presence of airway obstruction

n = 294

48.15

53.73

29.23

0.01

MMRC dyspnea score (mean)

n = 342

1.72

1.64

1.77

0.03

Borg dyspnea score (mean)

N = 342

3.31

3.33

3.41

0.12