A Randomized, Double-blind, Double-dummy, Parallel Group, Multicenter Study of Once Daily Fluticasone Furoate/Vilanterol 100/25 mcg Inhalation Powder, Twice Daily Fluticasone Propionate/Salmeterol 250/50 mcg Inhalation Powder, and Twice Daily Fluticasone Propionate 250 mcg Inhalation Powder in the Treatment of Persistent Asthma in Adults and Adolescents Already Adequately Controlled on Twice-daily Inhaled Corticosteroid and Long-acting beta2 Agonist

Change From Baseline in Evening (Post Meridiem [PM]) Forced Expiratory Volume in One Second (FEV1) Using Intent-to-Treat (ITT) Population

Time Frame: Baseline and Week 24

FEV1 was defined as the volume of air that can be forced out in one second after taking a deep breath. FEV1 (pre-bronchodilator and pre-dose) was measured at Baseline up to Week 24 at evening using spirometry. Repeated Measures analysis was adjusted for Baseline, region, sex, age, treatment, visit, visit by Baseline interaction and visit by treatment interaction. Visit 3 values were taken as Baseline value and change from Baseline was defined as the difference between the value of the endpoint at the time point of interest and the Baseline value. Statistical analysis was performed using the mixed model repeated measures (MMRM) model and least square mean and standard error were calculated. The analysis was performed on ITT Population which comprised of all participants randomized to treatment and who received at least one dose of study medication.

Change From Baseline in PM FEV1 Using Per Protocol (PP) Population

Time Frame: Baseline and Week 24

FEV1 was defined as the volume of air that can be forced out in one second after taking a deep breath. FEV1 (pre-bronchodilator and pre-dose) was measured at Baseline up to Week 24 at evening using spirometry. Repeated Measures analysis was adjusted for Baseline, region, sex, age, treatment, visit, visit by Baseline interaction and visit by treatment interaction. Visit 3 values were taken as Baseline value and change from Baseline was defined as the difference between the value of the endpoint at the time point of interest and the Baseline value. Statistical analysis was performed using the MMRM models and least square mean and standard error were calculated. The analysis was performed on PP Population which comprised of all participants in the ITT Population who did not had any full protocol deviations.