Table 1 Baseline characteristics of the 99 subjects

Age (years)

39

(22 – 54)

Males (n, %)

56

(57)

Current-smokers (n, %)

51

(52)

Cigarettes/day (n)^a

15

(3 – 29)

Packyears (n)^a

15

(10 – 20)

FEV₁ (%predicted)

105

(98 – 113)

FVC (%predicted)

113

(105 – 118)

FEV₁/FVC (%)

79

(76 – 84)

FEF_25–75 (%predicted)

83

(71 – 99)

RV/TLC (%predicted)

86

(77 – 96)

TLCOc/VA (%predicted)

96

(88 – 104)

R5 (kPa/L/s)

0.30

(0.25 – 0.36)

R20 (kPa/L/s)

0.28

(0.22 – 0.33)

R5-20 (kPa/L/s)

0.02

(0.00 – 0.05)

X5 (kPa/L/s)

−0.07

(−0.10 – −0.06)