| Mild | Moderate | Severe | p Fisher's Exact test |
Smokers with asthma (n=61) | 10/20 (50.0%) | 6/18 (33.3%) | 18/23 (78.3%) | 0.012 |
Never smokers with asthma (n=59) | 1/19 (05.3%) | 3/18 (16.7%) | 8/22 (36.4%) | 0.045 |
COPD (n=54) | 8/14 (57.1%) | 15/23 (65.2%) | 8/16 (50.0%) | 0.641 |