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Table 1 Descriptive statistics of preoperative and intraoperative variables analyzed in the whole sample (3315 patients)

From: A simple clinical model for planning transfusion quantities in heart surgery

Variables Frequency count and percentage
Sex (female) 1093 (33.0%)
Age > 70 years 1549 (46.7%)
Body surface area > 1.8 m2 1329 (40.1%)
Surgical procedure different from isolated coronary artery bypass graft 1559 (47.0%)
Previous cardiovascular surgery 147 (4.4%)
Emergency 67 (2.0%)
Non-routine procedure (urgency) 287 (8.7%)
Preoperative dialysis 21 (0.6%)
Systemic arterial hypertension 2227 (67.2%)
Diabetes requiring medical treatment 780 (23.5%)
Unstable angina 695 (21.0%)
Active endocarditis 16 (0.5%)
Recent myocardial infarction (< 7 days) 98 (3.0%)
Cardiogenic shock 32 (1.0%)
Chronic obstructive pulmonary disease 228 (6.9%)
Previous cerebrovascular events 165 (5.0%)
Admission hematocrit ≤ 40% 1973 (59.5%)
Antiplatelet therapy 1469 (44.3%)
Dicoumarole therapy 136 (4.1%)
Heparin therapy 1225 (37.0%)
Intraortic balloon pump insertion 83 (2.5%)
Serum creatinine > 1.2 mg/dl 599 (18.1%)
Cardiopulmonary bypass time > 130 minutes 1351 (40.8%)
Aortic clamping time > 90 minutes 1445 (43.6%)
Minimum hematocrit during cardiopulmonary bypass ≤ 20% 533 (16.1%)
Minimum temperature ≤ 32 °C 1639 (49.4%)