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Table 2 Logistic regression for in-hospital 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) 1.28 [0.97–1.69] 0.084 1.56 [1.16–2.11] 0.004
 Low volume (< 30 cases/year) 2.98 [2.48–3.58] < 0.001 3.12 [2.54–3.85] < 0.001
Age
 ≤ 49 Reference   Reference  
 50–59 1.11 [0.82–1.52] 0.502 1.14 [0.82–1.58] 0.449
 60–69 1.51 [1.15–1.97] 0.003 1.51 [1.12–2.03] 0.008
 70–79 2.17 [1.68–2.79] < 0.001 2.21 [1.64–2.99] < 0.001
 ≥ 80 2.69 [1.92–3.76] < 0.001 3.30 [2.25–4.85] < 0.001
Female 1.02 [0.87–1.20] 0.819 0.80 [0.66–0.97] 0.021
Extracardiac arteriopathy 1.30 [1.03–1.62] 0.024 1.08 [0.84–1.39] 0.559
Renal impairment 3.46 [2.09–5.75] < 0.001 1.88 [1.07–3.33] 0.029
Chronic lung disease 1.21 [1.02–1.43] 0.028 0.96 [0.79–1.16] 0.649
Hypertension 1.19 [1.01–1.41] 0.038 0.89 [0.72–1.09] 0.262
Hyperlipidemia 1.14 [0.95–1.37] 0.164 1.03 [0.83–1.29] 0.776
Diabetes 1.33 [1.01–1.75] 0.042 1.01 [0.74–1.38] 0.933
Angina pectoris 1.25 [1.03–1.50] 0.023 1.12 [0.89–1.39] 0.342
Recent MI 1.51 [0.88–2.58] 0.135 1.19 [0.66–2.14] 0.560
History of PCI 2.45 [1.31–4.58] 0.005 1.64 [0.80–3.39] 0.181
Congestive heart failure 1.42 [1.09–1.85] 0.010 1.13 [0.83–1.53] 0.428
Emergent surgery 2.02 [1.45–2.82] < 0.001 1.58 [1.09–2.31] 0.017
Atrial fibrillation 1.46 [1.04–2.06] 0.030 1.30 [0.89–1.90] 0.181
Perioperative RBC Transfusion
 0–1 units Reference   Reference  
 2–3 units 2.51 [1.27–4.95] 0.008 1.98 [0.99–3.96] 0.053
 4–5 units 5.25 [2.65–10.38] < 0.001 3.71 [1.86–7.43] < 0.001
 ≥ 6 units 16.51 [8.39–32.47] < 0.001 11.44 [5.75–22.79] < 0.001
Surgery site
 Ascending aorta Reference   Reference  
 Aortic arch 1.89 [1.39–2.56] < 0.001 1.55 [1.10–2.17] 0.012
 Descending thoracic aorta 1.07 [0.86–1.33] 0.558 1.25 [0.96–1.63] 0.091
 Combined 0.87 [0.71–1.06] 0.155 1.03 [0.82–1.29] 0.814
Surgery year 0.98 [0.94–1.01] 0.200 0.98 [0.94–1.02] 0.218
  1. CI Confidence interval, MI Myocardial infarction, OR Odds ratio, PCI Percutaneous coronary intervention, RBC Red blood cell
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