| Post-bronchodilator healthy children# | Post-bronchodilator asthmatics¶ | |||||
| Absolute values | z-scores | % change mean ± sd (2.5th–97.5th percentiles) | Absolute values | z-scores | % change mean ± sd | |
| FVC L | 1.86 (1.69–2.01) | 0.46 (0.02–0.77) | 0.3±3.3 | 1.90 (1.65–2.15) | −0.01 (−0.42–0.66) | −0.1±2.7 |
| FEV1 L | 1.71 (1.55–1.87) | 0.76 (0,31–1.43) | 4.5±3.4 (−2.2–11.2) | 1.68 (1.47–1.85) | 0.25 (−0.31–0.69) | 4.5±5.3 |
| FEV1/FVC | 0.92 (0.89–0.95) | 0.52 (−0.06–1.01) | 4.2±3.2 (−1.9–10.4) | 0.90 (0.84–0.92) | 0.06 (−0.73–0.63) | 4.7±5.0 |
| PEF L·s−1 | 3.85 (3.60–4.22) | NA | 5.4±8.1 (−10.6–21.3) | 3.84 (3.28–4.46) | NA | 5.5±10.7 |
| FEF25%–75% L·s−1 | 2.37 (2.23–2.92) | 1.03 (0.63–1.77) | 19.0±11.4 (−3.4–41.3) | 2.17 (1.83–2.57) | 0.34 (−0.27–1.07) | 19.7±19.8 |
| FEF50% L·s−1 | 2.79 (2.42–3.13) | NA | 18.7±16.2 (−13.1–50.5) | 2.46 (2.00–2.87) | NA | 22.8±20.4 |
| FEF75% L·s−1 | 1.25 (1.10–1.68) | NA | 26.5±17.1 (−7–59.9) | 1.15 (0.87–1.41) | NA | 27.7±26.9 |
Results shown are median (interquartile range), unless otherwise specified. FVC: forced vital capacity; FEV1: forced expiratory volume in 1 s; PEF: peak expiratory flow; FEF: forced expiratory flow at % of FVC; NA: not available. #: n=61; ¶: n=50