Fig. 1

Cumulative survival curves classified by age group, number of comorbidity and treatment in hospitalized elderly community-acquired pneumonia patients (n = 3011). a classification by age group, compared with the 65–74-year age group (n = 1085), *p = 0.002; compared with the 75–84-year age group (n = 1401), ^#p = 0.004. b classification by number of comorbidities. Cases with the numbers of comorbidities were 287, 913, 871 and 940. c classification by treatment compared with patients with adherent treatment (n = 1147), ^*p = 0.012; compared with patients with overtreatment (n = 1330), ^#p = 0.057