Mean (SD) pre-bronchodilator and post-bronchodilator spirometric values according to asthma diagnosis*
| Diagnosed asthma | Undiagnosed asthma | No asthma | |
|---|---|---|---|
| FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity. | |||
| *p<0.01 for all comparisons between diagnosed and undiagnosed asthma. | |||
| Pre FEV1 (l/s) | 2.75 (1.02) | 1.96 (0.79) | 3.17 (0.93) |
| % predicted Pre FEV1 | 89.8 | 72.2 | 100.1 |
| Post FEV1 | 2.89 (1.03) | 2.32 (0.87) | 3.26 (0.96) |
| % predicted Post FEV1 | 94.7 | 84.9 | 100.7 |
| Pre FVC (l) | 3.43 (1.15) | 2.75 (0.99) | 3.81 (1.08) |
| % predicted Pre FVC | 94.4 | 81.9 | 100.7 |
| Post FVC | 3.52 (1.12) | 3.04 (0.93) | 3.83 (1.09) |
| % predicted Post FVC | 97.1 | 91.1 | 101.2 |