FEV1 was measured in the morning by spirometry. At Visit 5, after trough FEV1 is measured, subject received investigational product. 3 hours post-dose, spirometry was repeated and subject then received 2 puffs of albuterol/salbutamol. After 30 minutes,spirometry was repeated.. Change from Baseline in clinic trough (pre-dose) FEV1 is the difference in the trough value at 3 hours post-dose peak FEV1 and the Baseline value. If the trough value or the Baseline was missing, then change from Baseline was considered as missing. Baseline value of clinic FEV1 is the last acceptable/borderline acceptable (pre-dose) FEV1 value obtained prior to randomization (from Visit 3 pre-dose or from Visit 2 pre-bronchodilator). Analysis done using analysis of covariance with covariates of treatment, age, sex, baseline clinic trough FEV1, pre-dose trough FEV1 at Visit 5, pack years smoked per randomization stratification and age when first treated with an inhaler per randomization stratification.