Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Demographic data of the subjects participating in the study
| Variables | Healthy non-smokers (n=20) | Asymptomatic smokers (n=19) | COPD (n=21) | p value |
|---|---|---|---|---|
| Age, yrs | 53.3±10.6 | 57.7±9.4 | 58±12.8 | 0.326 NS |
| Smoking, pack yrs | 0 | 22.2±11.6 | 45.1±36.3 | 0.012 S |
| FVC, % predicted | 92.7±15.2 | 97.2±17.9 | 69.8±16.7 | 0.000 HS |
| FEV1, % predicted | 89±10.6 | 98.7±17.6 | 47.5±16.9 | 0.000 HS |
| FEV1/FVC,% | 80.7±6.2 | 81.5±4.9 | 53.1±13.3 | 0.000 HS |
| BMI (kg/m2) | 23.7±4.0 | 23±4.3 | 19.1±4.8 | 0.003 HS |
