Table 4

Cox multivariable regression analyses of determinants of in-hospital mortality

VariablesHR95.0% CIP value
Age (tertiles)
 62–74 versus <62 years2.861.23 to 6.640.014
 ≥75 versus <62 years7.923.60 to 17.43<0.001
Number of comorbidities (tertiles)
 2–3 versus 0–11.851.11 to 3.080.018
 ≥4 versus 0–12.091.23 to 3.550.007
Respiratory rate (breaths/min), for unit increase1.041.02 to 1.070.001
PaO2/FiO2, for unit increase0.9950.992 to 0.997<0.001
Creatinine (mg/dL), for unit increase1.341.18 to 1.51<0.001
Platelets (109/L), for unit increase0.9950.992 to 0.9980.001
  • History of cardiovascular disease, hypertension, diabetes, depression, dementia and cancer were included into ‘comorbidities’. Variables excluded (p>0.10) from both models: No. of drugs, Barthel Index, C reactive protein.