Introduction: Previous studies demonstrated that tiotropium/olodaterol reduced rates of exacerbations in patients with chronic obstructive pulmonary disease (COPD). However, this should be examined in a wider population. Methods: This post hoc analysis pooled data from TONADO Ò 1 ? 2 and DYNAGITO Ò , three 52-week, parallel-group, randomised, doubleblind, phase III trials investigating patients with moderate-to-very severe COPD, with and without previous exacerbations, who received tiotropium/olodaterol 5/5 lg or tiotropium 5 lg. Subgroup analyses were conducted on patients stratified by exacerbation history, Global Initiative for Chronic Obstructive Lung Disease (GOLD) stage 2-4 disease severity and baseline inhaled corticosteroid (ICS) use. Results: In 9942 patients, tiotropium/olodaterol was associated with lower rates of moderate/severe exacerbations (0.68 vs. 0.77 per patient-year; rate ratio (RR) vs. tiotropium 0.89, 95% confidence interval (CI) 0.84, 0.95; Digital Features To view digital features for this article go to