Table 2.

Multivariable Cox regression for overall survival

Comorbidities	HR	95% CI	P value
Age ≥80 years+ventilation >48 hours	2.91	2.66 to 3.18	<0.001
Age ≥80 years+diabetes mellitus	1.44	1.31 to 1.57	<0.001
Age ≥80 years+previous myocardial infarction	1.37	1.23 to 1.53	<0.001
Age ≥80 years+chronic limb-threatening ischaemia	1.59	1.38 to 1.82	<0.001
Age ≥80 years+chronic kidney disease	1.26	1.15 to 1.37	<0.001
Age ≥80 years+dementia	1.29	1.17 to 1.44	<0.001

P value ‘for comparisons of patients in all groups’.