Fig. 1From: Impact of prior and concurrent medication on exacerbation risk with long-acting bronchodilators in chronic obstructive pulmonary disease: a post hoc analysisTime to first exacerbation (a) and trough FEV1 profile (b) (ITT population). CI, confidence interval; FEV1, forced expiratory volume in 1 s; ITT, intent-to-treat; LS, least squares; PBO, placebo; SE, standard error; UMEC, umeclidinium; VI, vilanterolBack to article page