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Table 5 Descriptive statistics for all dichotomous (preoperative and intraoperative) predictors included in the model and for some essential postoperative variables in three groups of patients: group I, where the difference between the model estimate and the actual number of packs transfused was greater than two (303 patients); group II, where the absolute value of the difference between the number of packs transfused and the number estimated by model was not more than two packs (2574 patients); group III, where the difference between the actual number of packs transfused and the model estimate was greater than two packs (438 patients)

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

Variables Frequency count and percentage in group I Frequency count and percentage in group II Frequency count and percentage in group III
Preoperative and intraoperative predictors included in the model
Hctadmission ≤ 40% 257 (84.8%) 1450 (56.3%) 266 (60.7%)
CBP time > 130 min 222 (73.3%) 929 (36.1%) 200 (45.7%)
Minimum HctCBP ≤ 20% 108 (35.6%) 333 (12.9%) 92 (21.0%)
Surgical procedure different
from isolated CABG
230 (75.9%) 1098 (42.7%) 231 (52.7%)
Age > 70 years 212 (70.0%) 1146 (44.5%) 241 (55.0%)
Cardiogenic shock 9 (29.0%) 17 (54.8%) 5 (16.1%)
Preoperative dialysis 7 (2.3%) 8 (0.3%) 6 (1.4%)
Systemic arterial hypertension 243 (80.2%) 1701 (66.1%) 28 (64.6%)
Urgency 22 (7.3%) 220 (8.5%) 4 (10.3%)
Emergency 19 (6.3%) 37 (1.4%) 10 (2.3%)
Postoperative variables
Morbidity 150 (49.5%) 812 (31.5%) 311 (71.0%)
Reoperation for bleeding 14 (4.6%) 57 (2.2%) 118 (26.9%)
Lung dysfunction 58 (19.1%) 280 (10.9%) 178 (40.6%)
Low cardiac output 54 (17.8%) 239 (9.3%) 149 (34.0%)
Cardiac arrhythmia 37 (12.2%) 193 (7.5%) 64 (14.6%)
Coma 2 (0.7%) 15 (0.6%) 18 (4.1%)
Stroke 3 (1.0%) 19 (0.7%) 11 (2.5%)
Acute kidney failure 4 (1.3%) 26 (1.0%) 41 (9.4%)
Kidney dysfunction 16 (5.3%) 103 (4.0%) 21 (4.8%)
Sepsis 2 (0.7%) 7 (0.3%) 17 (3.8%)
Pneumonia 3 (1.0%) 17 (0.7%) 31 (7.8%)
Sternal wound infection 2 (0.7%) 7 (0.3%) 8 (1.8%)
Death 4 (1.3%) 26 (1.0%) 28 (6.4%)
Mechanical ventilation > 1 day 50 (16.5%) 206 (8.0%) 166 (37.9%)
Intensive care > 5 days 30 (5.2%) 135 (9.9%) 128 (29.2%)
  1. Hct = hematocrit; CPB = cardiopulmonary bypass; CABG = coronary artery bypass graft.