Dataset from A 12-week Study to Evaluate the 24 Hour Pulmonary Function of Fluticasone Furoate (FF)/Vilanterol Inhalation Powder (FF/VI Inhalation Powder) Once Daily Compared With Salmeterol/Fluticasone Propionate (FP) Inhalation Powder Twice Daily in Subjects With Chronic Obstructive Pulmonary Disease (COPD)

The purpose of this study is to evaluate the 24-hour spirometry effect (FEV1) of Fluticasone Furoate/Vilanterol 100/25mcg once daily compared with Salmeterol/Fluticasone Propionate 50/500mcg twice daily over a 12-week treatmen period in subjects with COPD.