Fig. 2.

Survival curve analysis showing different survival rates in patients with versus without comorbidities. a Patients with comorbidities had a lower survival rate than those without any comorbidity. b A lower survival rate was observed in patients with comorbid neurological diseases than those without. c-f The survival rate did not differ between patients with other system diseases and those without. g The survival rate did not differ between patients with and without bidirectional comorbidities. h The survival rate did not differ between patients with and without causal comorbidities. i The survival rate was lower in patients with other comorbidities than in those without other comorbidities