Characteristics of subjects in the rate of lung-function decline study
| Fast decline | Nondecline | p-value | |
| Patients n | 279 | 304 | |
| Male/female n | 163/117 | 203/101 | 0.04 |
| Age yrs | 49.5±0.4 | 47.6±0.4 | 0.0005 |
| Smoking history pack-yrs | 43.0±1.1 | 38.3±1.0 | 0.003 |
| Smoking amount cigarettes·day-1 | 25.6±0.6 | 22.4±0.6 | 0.0003 |
| ΔFEV1 % pred·yr-1 # | -4.13±0.06 | 1.08±0.04 | <0.0001 |
| ΔFEV1 ml·yr-1 | -153.5±2.6 | 15.1±1.5 | <0.0001 |
| Baseline pre-bronchodilator FEV1 % pred¶ | 72.5±0.5 | 75.7±0.5 | <0.0001 |
Data are presented as mean±se, unless otherwise stated. Δ: change; FEV1: forced expiratory volume in one second; % pred: % predicted. #: change in lung function per year over 5-yr period; ¶: lung function at the start of the Lung Health Study.