FIGURE 1.

a) The time-dependent risk of reaching the composite end-points between patients with or without any comorbidity. b) The time-dependent risk of reaching the composite end-points between patients without any comorbidity, patients with a single comorbidity and patients with two or more comorbidities. Cox proportional hazard regression models were applied to determine the potential risk factors associated with the composite end-points, with the hazard ratio and 95% confidence interval being reported.