Table 4 Summary of factors associated with hospital survival for patients aged ≥ 80 years

Admission from chronic care facility

1.35 (1.09 to 1.67)

0.005

Co-morbid disease (present)

   ≤ 1

1.0^a

   ≥ 2

1.31 (1.12 to 1.52)

0.001

Admission type (present)

   Elective surgical

1.0^a

   Emergency surgical

1.83 (1.58 to 2.13)

<0.001

   Medical

2.58 (2.22 to 3.00)

<0.001

Admission diagnosis (present)

   Sepsis

1.24 (1.10 to 1.40)

<0.001

   Trauma

1.28 (1.05 to 1.57)

0.016

   Hepatic

1.21 (1.02 to 1.44)

0.025

   Gastrointestinal (nonbleeding)

1.72 (1.48 to 1.99)

<0.001

   Cardiac

1.54 (1.34 to 1.77)

<0.001

   Neurologic

1.92 (1.59 to 2.33)

<0.001

   Respiratory

1.29 (1.11 to 1.49)

0.01

   Metabolic

0.53 (0.36 to 0.76)

0.01

Nonage-related APACHE II score (per point)

1.11 (1.10 to 1.11)

<0.001

Mechanical ventilation (present)

1.18 (1.07 to 1.30)

0.001

Acute kidney injury (present)

1.38 (1.25 to 1.51)

<0.001

ICU length of stay (log-transformed) (per day)

1.17 (1.11 to 1.24)

<0.001