Fig. 4From: A 28-day, randomized, double-blind, placebo-controlled, parallel group study of nebulized revefenacin in patients with chronic obstructive pulmonary diseaseEffect of revefenacin on rescue medication use. a albuterol puffs per day; data presented as LS mean ± SE. b percent of albuterol-free 24-h periods over the entire treatment period; data presented as LS mean difference from placebo ± SE. *p < 0.05; **p < 0.005. Abbreviations: LS: least squares; SE: standard errorBack to article page