Reference sample selection criteria and characteristics of the study sample
Males | Females | |
Participants (White) interviewed n | ||
Total | 13883 | 16646 |
Less invalid spirometry data | 11854 | 13554 |
Less ever smokers | 4643 | 6845 |
Less nonhealthy subjects | 3107 | 4195 |
Less irreproducible data | 2497 | 3556 |
Age in years n | ||
16–24 | 424 | 507 |
25–34 | 620 | 802 |
35–44 | 583 | 750 |
45–54 | 376 | 593 |
55–64 | 260 | 416 |
65–74 | 157 | 329 |
75–84 | 51 | 134 |
≥85 | 8 | 25 |
Age last birthday yrs | 40±15.7 | 43±17.0 |
Height cm | 176±6.8 | 162±6.4 |
FEV1 L | 4.1±0.81 | 2.9±0.65 |
FVC L | 5.0±0.94 | 3.5±0.74 |
FEV1/FVC | 0.82±0.072 | 0.83±0.071 |
Data are presented as absolute values or mean±sem
FEV1: forced expiratory volume in one second
FVC: forced vital capacity