Adverse events are defined as any unfavorable and unintended diagnosis, symptom, sign (including an abnormal lab finding), syndrome or disease which either occurs during study, having been absent at baseline, or, if present at baseline, appears to worsen. Serious adverse events are any untoward medical occurrences that result in death, are life threatening, require (or prolong) hospitalization, cause persistent or significant disability/incapacity, result in congenital anomalies or birth defects, or are other conditions which in judgments of the investigators represent significant hazards.

Baseline FEV1 was defined as the average of the -45 min and -15 min FEV1 values taken on day 1 prior to the first dose of study medication. Trough FEV1 was defined as the mean of the post-dose 23 h 15 min and the 23 h 45 min FEV1 values. FEV1 was measured using central spirometry according to ATS/ERS standardization. Trough FEV1 was analyzed using a MIXED model for the full analysis set population. The model contained treatment as a fixed effect with the baseline FEV1 measurement, FEV1 prior to inhalation of short acting bronchodilator, FEV1 45 min post inhalation of short acting bronchodilator and baseline inhaled corticosteroids (ICS) use as covariates.