Table 1.
Demographic data of subjects.
| Group | Never-smokers (NS) | Ex-smokers (ExS) | Current smokers (CS) | COPD GOLD stage 1 (S1) | COPD GOLD stage 2 (S2) | COPD GOLD stage 3 (S3) |
|---|---|---|---|---|---|---|
| Number | 11 | 25 | 9 | 7 | 37 | 13 |
| Age (yrs) | ||||||
| Median (range)∗ | 56 (41–67) | 71 (42–80) | 69 (42–76) | 65 (61–82) | 68 (46–82) | 67 (47–84) |
| F/M | 6/5 | 12/13 | 3/6 | 2/5 | 18/19 | 5/8 |
| FEV1-% | ||||||
| Median (range)§ | 97 (87–134) | 98 (74–124) | 96 (84–115) | 87 (80–103) | 62 (51–77) | 42 (30–49) |
| Ex-smokers | 0 | 25 | 0 | 4 | 30 | 8 |
| Current smokers | 0 | 0 | 9 | 3 | 7 | 5 |
∗The age of the NS group was significantly different from S2; there were no other significant age differences between groups (by Kruskal-Wallis test with Dunn's post hoc test for multiple comparisons).
§The NS, ExS, and CS groups were all significantly different from both S2 and S3 for FEV1-% of predicted, and S1 was significantly different from S3; there were no other significant differences between groups (by Kruskal-Wallis test with Dunn's post hoc test for multiple comparisons).