Mean (SE) forced expiratory volume in one second (FEV1) before and after a cumulative dose of 1500 μg terbutaline by Turbohaler and percentage change in the β agonist reduction and control groups
| Reduction group | Control group | |
|---|---|---|
| Baseline | ||
| Before terbutaline (l) | 2.62 (0.19) | 2.32 (0.2) |
| After terbutaline (l) | 2.8 (0.19) | 2.67 (0.19) |
| % change | 8.4 | 14.9 |
| Week 12 | ||
| Before terbutaline (l) | 2.48 (0.19) | 2.34 (0.18) |
| After terbutaline (l) | 2.81 (0.2) | 2.55 (0.18) |
| % change | 17.7 | 9.7 |