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Rate of on-treatment severe exacerbations up to Week 24 by recent exacerbation subgroup. aPost hoc. bIn the year prior to study entry.
Abbreviations: BUD, budesonide; CI, confidence interval; FF, fluticasone furoate; FOR, formoterol; ITT, intent-to-treat; UMEC, umeclidinium; VI, vilanterol.
