Demographic information of first visit patients with normal spirometry
| Male:female | 6520:6315 |
| Mean | SD | |
| Age (years) | 61.0 | 16.1 |
| FEV1 SR | 0.92 | 1.24 |
| FVC SR | 1.40 | 1.40 |
| FEV1/FVC SR | 0.11 | 0.76 |
| TLCOc SR | −1.35 | 1.73 |
| KCOc SR | −0.79 | 1.51 |
Lung function results are presented as standardised residual (SR).
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; KCOc, transfer coefficient of the lung for carbon monoxide corrected; TLCOc, transfer for carbon monoxide corrected.