Table 1.
Clinical data of the study subjects
| Never-smokers | Current Smokers | Current Smokers with COPD | Ex-smokers with COPD | |
|---|---|---|---|---|
| n | 40 | 40 | 27 | 11 |
| Male|Female | 20|20 | 20|20 | 15|12 | 5|6 |
| Age | 57 (6.99) | 54 (6.10) | 59 (5.05) | 60 (5.55) |
| Pack years | 0 (0) | 35.2 (12.4) | 42.1 (10.2) | 29.4 (9.1) |
| Cigarettes/day past 6 month | 0 | 17.8 (6.61) | 16.5 (6.44) | 0 |
| FEV1 (% of predicted) | 118 (12.8) | 109 (11.9) | 78.7 (10.5) | 78.6 (14.6) |
| FEV1/FVC | 0.81 (0.54) | 0.78 (0.47) | 0.61 (0.60) | 0.60 (0.78) |
| FEV1/VC | 0.80 (0.74) | 0.76 (0.63) | 0.60 (0.90) | 0.56 (0.11) |
| DLCO (% of predicted) | 92.5 (11.3) | 79 (12.2) | 66.4 (12.5) | 69.5 (16.2) |
| TLC (L) | 6.56 (1.23) | 6.52 (1.28) | 6.66 (1.19) | 6.60 (1.04) |
| Chronic Bronchitis (n) | 0 | 10 | 7 | 2 |
Data is shown as mean and standard deviation. FEV1 Forced expiratory volume in 1 s, FVC Forced vital capacity, VC Vital capacity, DLCO Diffusing Capacity for Carbon Monoxide, TLC Total Lung Capacity