A multicenter, cross-sectional, observational study of budesonide/formoterol maintenance and reliever therapy in real-world settings

•Asthma control level with budesonide/formoterol in real-world in China was assessed.•1483 asthma out-patients from 27 medical centers were enrolled in this study.•Asthma was controlled in 58.6% patients and partly controlled in 35.5% patients.•Long asthma duration and old age were associated with lower control levels.