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Table 1 Patient characteristics and preoperative comorbidities according to case volume

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

  Low volume
(< 30 cases/year, n = 1928)
Medium volume
(30–60 cases/year, n = 717)
High volume
(> 60 cases/year, n = 2222)
P
Age (years) 61.9 (14.4) 60.6 (14.7) 63.2 (13.3) < 0.001
Female 969 (50.3%) 340 (47.4%) 844 (38.0%) < 0.001
Extracardiac arteriopathy 250 (13.0%) 77 (10.7%) 298 (13.4%) 0.174
Renal impairment 31 (1.6%) 7 (1.0%) 29 (1.3%) 0.430
Chronic lung disease 623 (32.3%) 239 (33.3%) 745 (33.5%) 0.695
Hypertension 1151 (59.7%) 397 (55.4%) 1446 (65.1%) < 0.001
Hyperlipidemia 382 (19.8%) 154 (21.5%) 618 (27.8%) < 0.001
Diabetes mellitus 150 (7.8%) 42 (5.9%) 193 (8.7%) 0.049
Atrial fibrillation 66 (3.4%) 26 (3.6%) 133 (6.0%) < 0.001
Angina pectoris 351 (18.2%) 154 (21.5%) 521 (23.5%) < 0.001
Recent MI 42 (2.2%) 7 (1.0%) 37 (1.7%) 0.101
History of PCI 15 (0.8%) 8 (1.1%) 26 (1.2%) 0.429
Congestive heart failure 157 (8.1%) 69 (9.6%) 180 (8.1%) 0.405
Emergent surgery 104 (5.4%) 27 (3.8%) 70 (3.2%) 0.001
Perioperative RBC Transfusion (units) 4 (3–5) 3 (2–4) 3 (2–5) < 0.001
Surgery site     < 0.001
 Ascending aorta 805 (41.8%) 312 (43.5%) 330 (14.9%)  
 Aortic arch 185 (9.6%) 30 (4.2%) 81 (3.7%)  
 Descending thoracic aorta 283 (14.7%) 144 (20.1%) 672 (30.2%)  
 Combined 655 (34.0%) 231 (32.2%) 1139 (51.3%)  
  1. Data are presented as number (%), mean (standard deviation), or median (interquartile range)
  2. MI Myocardial infarction, PCI Percutaneous coronary intervention, RBC Red blood cell