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Table 3 Univariate Cox regression analysis results

From: Risk factors for postoperative delirium in patients with triple-branched stent graft implantation

Variables β SE Wald HR 95%CI P
Age 0.006 0.011 0.308 1.006 0.985–1.027 0.579
BMI 0.002 0.027 0.952 1.002 0.949–1.057 0.952
Hypertension
No Reference
Level 1 0.242 0.322 0.566 1.274 0.678–2.393 0.452
Level 2 0.619 0.297 3.342 1.857 1.037–3.325 0.068
Level 3 0.553 0.303 3.343 1.739 0.961–3.147 0.068
Nature of occupation
Manual worker Reference
Non-manual worker −0.706 0.241 8.582 0.494 0.308–0.792 0.003
Medical payment method 0.159 0.202 0.618 1.172 0.789–1.740 0.432
First blood sugar 0.009 0.021 0.168 1.009 0.967–1.052 0.682
Mechanical ventilation duration 0.001 0.001 0.269 1.001 0.998–1.003 0.604
APACHE-II score
< 15 Reference
≤15–20 0.664 0.233 8.126 1.943 1.231–3.069 0.004
> 20 1.622 0.303 28.740 5.064 2.779–9.165 < 0.001
ICU stay −0.044 0.024 3.335 0.956 0.912–1.003 0.068
Hypoxemia 0.894 0.213 17.545 2.445 1.609–3.715 < 0.001
Analgesics and sedatives
0–2 Reference
3–4 0.896 0.266 11.381 2.450 1.456–4.123 0.001
> 4 1.760 0.387 20.650 5.811 2.720–12.413 < 0.001
Aortic cross-clamping duration 0.001 0.002 0.315 1.001 0.997–1.006 0.575
  1. SE Standard error, HR Hazard ratio, CI Confidence intervals
  2. BMI Body mass index, APACHE-II Acute physiology and chronic health evaluation II