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Table 3 Logistic regression for 1-year mortality after thoracic aorta replacement surgery

From: Association between institutional case volume and mortality following thoracic aorta replacement: a nationwide Korean cohort study

  Univariable model Multivariable model
OR [95% CI] P OR [95% CI] P
Case volume strata
 High volume (> 60 cases/year) Reference   Reference  
 Medium volume (30–60 cases/year) 1.12 [0.89–1.42] 0.340 1.45 [1.12–1.87] 0.005
 Low volume (< 30 cases/year) 2.36 [2.02–2.76] < 0.001 2.62 [2.18–3.14] < 0.001
Age
 ≤ 49 Reference   Reference  
 50–59 1.16 [0.88–1.53] 0.278 1.23 [0.92–1.65] 0.168
 60–69 1.63 [1.29–2.08] < 0.001 1.72 [1.32–2.25] < 0.001
 70–79 2.53 [2.02–3.16] < 0.001 2.81 [2.15–3.68] < 0.001
 ≥ 80 3.62 [2.70–4.87] < 0.001 5.05 [3.58–7.12] < 0.001
Female 0.94 [0.82–1.08] 0.397 0.69 [0.58–0.82] < 0.001
Extracardiac arteriopathy 1.42 [1.17–1.73] < 0.001 1.18 [0.94–1.47] 0.157
Renal impairment 4.06 [2.50–6.58] < 0.001 2.37 [1.37–4.08] 0.002
Chronic lung disease 1.28 [1.10–1.48] < 0.001 1.00 [0.84–1.18] 0.980
Hypertension 1.27 [1.10–1.48] 0.001 0.94 [0.78–1.13] 0.520
Hyperlipidemia 1.18 [1.01–1.38] 0.048 1.02 [0.83–1.24] 0.882
Diabetes 1.39 [1.09–1.77] 0.008 1.01 [0.76–1.33] 0.957
Angina pectoris 1.20 [1.02–1.42] 0.030 1.00 [0.82–1.22] 0.994
Recent MI 1.50 [0.92–2.43] 0.101 1.14 [0.66–1.95] 0.643
History of PCI 2.61 [1.46–4.66] 0.001 1.76 [0.90–3.44] 0.101
Congestive heart failure 1.37 [1.08–1.74] 0.010 1.09 [0.83–1.44] 0.527
Emergent surgery 1.78 [1.31–2.43] < 0.001 1.50 [1.05–2.13] 0.026
Atrial fibrillation 1.34 [0.98–1.83] 0.069 1.08 [0.76–1.54] 0.655
Perioperative RBC Transfusion
 0–1 units Reference   Reference  
 2–3 units 2.01 [1.21–3.34] 0.007 1.56 [0.93–2.63] 0.092
 4–5 units 4.09 [2.46–6.80] < 0.001 2.89 [1.71–4.87] < 0.001
 ≥ 6 units 13.31 [8.03–22.08] < 0.001 9.15 [5.43–15.42] < 0.001
Surgery site
 Ascending aorta Reference   Reference  
 Aortic arch 1.98 [1.49–2.62] < 0.001 1.63 [1.19–2.23] 0.002
 Descending thoracic aorta 1.20 [0.98–1.46] 0.074 1.36 [1.07–1.72] 0.011
 Combined 1.04 [0.87–1.24] 0.675 1.20 [0.98–1.47] 0.075
Surgery year 0.97 [0.94–1.00] 0.057 0.96 [0.93–0.99] 0.015
  1. CI Confidence interval, MI Myocardial infarction, OR Odds ratio, PCI Percutaneous coronary intervention, RBC Red blood cell
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