FIGURE 3.

Time-to-first combined a) moderate or severe and b) severe COPD exacerbations (post-hoc analysis) by treatment by prior exacerbation subgroup for each treatment comparison. The exacerbation history subgroups are defined as single moderate (1 moderate/no severe exacerbation in the prior year), frequent moderate (≥2 moderate/no severe exacerbations in the prior year) and severe (≥1 severe/any moderate exacerbation in the prior year). Data are presented as patients with events n/N (%), unless otherwise stated. FF: fluticasone furoate; UMEC: umeclidinium; VI: vilanterol.