Table 1.
Characteristics and lung function data for chronic obstructive pulmonary disease (COPD) patients, ‘healthy’ smokers (HS) and non-smokers (NS).
| COPD (n = 16) | HS (n = 10) | NS (n = 9) | |
|---|---|---|---|
| Age (years) | 57 (55–60) | 57 (50–62) | 54 (52–59) |
| Tobacco (pack-years) | 34 (26–43)### | 28 (24–42)††† | 0 |
| Sex (male/female) | 9/7 | 8/2 | 5/4 |
| FEV1/VC (%) | 50 (42–55)***### | 75 (73–83) | 77 (76–80) |
| FEV1 (% of predicted) | 53 (47–61)***### | 95 (90–114) | 108 (99–109) |
| Reversibility (% of predicted FEV1) | 6 (1–7) | 3 (0–5) | 1 (0–3) |
Data are shown as mean and standard deviation for age, median and inter quartile range for all others. Significant difference between groups is marked with * (COPD versus HS), # (COPD versus NS) and † (HS versus NS). The considered levels of significance were P < 0·05 ( *, # or †), P < 0·01 (**, ## or ††) and P < 0·001
***
,
###
or
†††
.
FEV1: forced expiratory volume in 1 s, measured post-bronchodilation; VC: vital capacity.