Table 1 Characteristics of COPD and healthy subjects

Age (years)

53 ± 5 [%95 Cl 52–56]

51 ± 6 [%95 Cl 47–54]

0.125

Sex (male/female)

15/5

16/4

1.0

Height (cm)

167±9 [%95 Cl 163–172]

166 ± 7 [%95 Cl 163–169]

0.496

Body weight (kg)

79 ± 18 [%95 Cl 69–86]

80 ± 10 [%95 Cl 72–82]

0.77

Body mass index (kg/m²)

28 ± 5 [%95 Cl 25–30]

27 ± 4 [%95 Cl 26–30]

0.389

FVC (%)

66 ± 19 [%95 Cl 56–75]

99 ± 13 [%95 Cl 91–105]

0.001*

FEV₁ (%)

49 ± 19 [%95 Cl 39–58]

98 ± 12 [%95 Cl 90–103]

0.001*

FEV₁/FVC (%)

63 ± 13 [%95 Cl 56–68]

82 ± 5 [%95 Cl 79–85]

0.001*

FEF_25-75% (%)

28 ± 17 [%95 Cl 19–33]

89 ± 22 [%95 Cl 75–100]

0.001*

PEF (%)

57 ± 22 [%95 Cl 45–65]

105 ± 21 [%95 Cl 95–118]

0.001*

Smoking history (pack-years)

30 ± 24 [%95 Cl 19–42]

13 ± 15 [%95 Cl 5–22]

0.024*

MMRC (0–4)

1.4 ± 1.0 [%95 Cl 1–2]

0.3 ± 0.6 [%95 Cl -0.1-56]

0.001*