Table 4.

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

	30-day mortality	1-year mortality
Male sex	1.8 (1.5–2.4)**	1.5 (1.4–3.0)**
ICU admission	1.9 (1.2–4.2)	1.3 (0.7–2.1)
Age ≥85 years	2.7 (1.4–5.2)*	3.1 (2.2–5.3)*
Preoperative comorbidities
Cardiovascular disease	1.6 (1.2–1.9)	1.3 (1.1–1.8)*
Diabetes	1.2 (0.9–1.8)	1.4 (1.2–1.7)*
Respiratory disease	1.9 (1.3–2.4)**	1.6 (1.2–1.8)*
Stroke	1.2 (1.1–1.7)	1.1 (0.9–1.4)
Dementia	2.0 (1.4–4.7)*	2.5 (2.2–3.8)
Renal disease	1.8 (1.3–4.0)	2.2 (1.5–4.4)*
Hypoxia	3.3 (0.8–13.2)	1.8 (0.6–5.4)
Malignancy	1.3 (1.0–2.1)	1.6 (1.3–2.6)*
Comorbidities ≥3	2.1 (1.7–3.0)	2.5 (2.0–3.6)
ASA ≥3	2.3 (1.9–3.4)**	3.6 (2.6–5.0)**
Postoperative complications
Acute cardiovascular events	8.1 (5.2–18.3)**	6.5 (3.1–11.0)**
Myocardial infarction	11.0 (2.3–56.7)**	10.4 (2.0–56.1)**
Acute respiratory events	7.5 (6.2–11.0)**	5.1 (4.3–6.2)**
Stroke	8.6 (4.6–17.0)**	5.5 (3.3–8.4)*
Delirium	1.8 (0.9–4.06)	1.8 (0.9–4.2)
DVT/PE	2.1 (1.1–4.6)	2.6 (1.7–3.8)
Hypoxia	2.8 (0.9–8.8)*	2.0 (0.8–4.6)
Anemia	0.9 (0.4–2.5)	1.8 (0.9–3.8)
Deep wound infection	0.4 (0–5.7)	1.1 (1.3–3.4)
≥3 complications	13.8 (8.7–18.5)**	6.8 (5.9–8.5)**

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

^*P<0.05;

^**P<0.01.

Abbreviations: ASA, American Society of Anesthesiologists; ICU, intensive care unit; DVT/PE, deep vein thrombosis/pulmonary embolus.