Fig. 2
Incidence rate ratios of HCRU events for severe versus non-severe asthma patients. Data presented as IRR (95% CI). Error bars represent 95% CI values. *P < 0.001 (P values were calculated using χ2 test for categorical variables, t-test for continuous variables). IRR is the ratio of incidence rates of all-cause HCRU events in severe and non-severe asthma patients. IRR adjusted for age, gender, insurance type, institution type, baseline comorbidity of interests, and Charlson index score. CI confidence interval, ER emergency room, HCRU healthcare resource utilization, IRR incidence rate ratio
