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) |
| FEF25–75 (%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) |
Values are presented as medians with interquartile ranges unless stated otherwise
FEV 1 forced expiratory volume in 1 s, FVC forced vital capacity, FEF 25–75 forced expiratory flow between 25 and 75% of FVC, RV/TLC residual volume/total lung capacity, TLCOc diffusion capacity of the lung for carbon monoxide, corrected for hemoglobin level, VA alveolar volume, R5 resistance at 5 Hz, R20 resistance at 20Hz, R5-20 difference between R5 and R20, X5 reactance at 5 Hz, AX reactance area
aonly in current-smokers