Background: Continuity of care (COC) is positively associated with health care outcomes. However, the effect of COC on the reduction of asthma-related emergency department (ED) visits among older asthmatic patients is not clearly understood.Methods: We conducted a retrospective cohort study using the Taiwan Results: Among a total of 3395 subjects, the overall mean COC was 0.73, and 48.5% of subjects had perfect COC (COCI ؍ 1). After controlling for covariables, in the group of patients with low COC, the risk of having an asthma-related ED visit was higher compared with those with perfect COC (Adjusted HR, 2.11; 95% CI, 1.37؊3.25).Conclusions