An AE was defined as any unfavorable or unintended sign, symptom, or disease temporally associated with the use of a Study Drug, whether or not considered related to the Study Drug. An AE could potentially be a new disease, any untoward event, or an exacerbation of a pre-existing condition. AEs included, but were not limited to: Any symptom not previously reported by the patient (medical history) An exacerbation of a pre-existing illness An increase in frequency or intensity of a pre-existing episodic event or condition A condition first detected or diagnosed after Study Drug administration even though the condition may have been present before the start of the study Overdose of Study Drug

FEV1 was the volume of air exhaled in first second of a forced expiration as measured by spirometer. Least squares (LS) mean and standard error (SE) were determined from an analysis of covariance model with terms for treatment, region (US, non-US), and age (12 to 18 years, \> 18 years), and Baseline FEV1 (\< 55%, . 55%).