Table 5.

Multivariate Cox regression analysis of the variables for 30-day and 1-year mortality

	30-day mortality	1-year mortality
Male sex	1.5 (1.1–2.0)*	1.8 (1.6–3.5)**
ICU admission	1.8 (1.1–4.1)	1.3 (0.8–2.3)
Age ≥85 years	1.7 (1.2–3.8)	2.1 (1.6–4.3)
Preoperative comorbidities
Cardiovascular disease	0.8 (0.7–1.2)	1.1 (0.9–1.8)
Diabetes	1.0 (0.8–1.6)	1.3 (1.1–1.7)*
Respiratory disease	2.2 (1.7–3.2)*	1.7 (1.2–2.8)*
Stroke	1.0 (0.9–1.8)	1.1 (0.9–1.5)
Dementia	1.8 (1.3–3.7)	2.2 (2.0–3.8)
Renal disease	1.6 (1.3–3.0)*	1.4 (1.1–3.4)*
Hypoxia	2.8 (1.8–7.4)	1.3 (0.6–2.4)
Malignancy	1.3 (1.1–2.3)*	1.5 (1.2–2.8)**
Postoperative complications
Acute cardiovascular events	6.2 (5.0–11.2)**	4.4 (3.1–9.3)**
Myocardial infarction	4.0 (2.5–6.6)**	3.4 (2.0–4.1)**
Acute respiratory events	4.0 (3.6–9.2)**	3.8 (3.0–6.7)**
Stroke	1.6 (1.2–5.3)**	2.5 (2.1–5.4)*
Acute renal impairment	2.0 (0.8–3.6)	2.1 (1.1–3.8)
Hypoxia	2.5 (0.9–4.8)	1.8 (1.1–2.6)

Notes: Figures are hazard ratios (95% confidence intervals).

^*P<0.05;

^**P<0.01.

Abbreviation: ICU, intensive care unit.