Table 1.
Demographic characteristic of the study participants who provided serum samples.
| CS | S | NS | ||
|---|---|---|---|---|
| Number of patients | 6 | 6 | 6 | |
| Gender | Male/female | 3/3 | 1/5 | 1/5 |
| Age (years) | Mean | 63·67† | 51·83 | 50·83 |
| Median | 65 (54–72) | 49·5 (43–63) | 51·5 (45–57) | |
| FEV1 | Mean | 51·50*† | 98·50 | 115·2 |
| (% pred) | Median | 53 (17–71) | 100·5 (81–119) | 110 (103–140) |
| FVC | Mean | 83·50 | 106·8 | 122·2 |
| (%) | Median | 80 (44–135) | 108 (81–128) | 115·5 (112–144) |
| FEV1/ | Mean | 61·54*† | 92·61 | 94·60 |
| FVC (%) | Median | 65·46 (39·4–72·9) | 91 (84–101·7) | 5·73 (79·1–107·2) |
| Smoking | Mean | 47·86 | 29·52 | 0 |
| (pack/year) | Median | 57·50 (23·8–62·2) | 29·38 (15–42) | 0 |
CS = smokers with chronic obstructive pulmonary disease; S = smokers without airway obstruction; NS = never smokers; FEV1 = forced expiratory volume in 1 s; FVC = forced vital capacity; Pred = predicted value.
*
Indicates significant difference between CS and S (P < 0·001).
†
Indicates significant difference between CS and NS (P < 0·001).