- A post-bronchodilator FEV1(Forced Expiratory Volume in one second) ≥ 40 and < 80% of the predicted normal value and FEV1/FVC (Forced Vital Capacity) < 0.7, after 4 puffs (4 x 100 µg) of salbutamol pMDI. If this criterion is not met at screening, the test can be repeated once before commencing of the run-in period.