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Table 1 Results of epidemiologic studies on anemia and blood transfusions in critical care

From: Scope of the problem: epidemiology of anemia and use of blood transfusions in critical care

  ABC Trial [2] (Western Europe) CRIT Study [3] (USA) TRICC Investigators [9] (Canada) North Thames Blood Interest Group [5] (UK)
n 3534 4892 5298 1247
Mean admission hemoglobin (g/dl) 11.3 ± 2.3 11.0 ± 2.4 9.9 ± 2.2 -
Percentage of patients transfused in ICU 37.0% 44.1% 25% 53.4%
Mean transfusions per patient (units) 4.8 ± 5.2 4.6 ± 4.9 4.6 ± 6.7 5.7 ± 5.2
Mean pretransfusion hemoglobin (g/dl) 8.4 ± 1.3 8.6 ± 1.7 8.6 ± 1.3 8.5 ± 1.4
Mean ICU length of stay (days) 4.5 7.4 ± 7.3 4.8 ± 12.6 -
ICU mortality 13.5% 13.0% 22% 21.5%
Hospital mortality 20.2% 17.6% - -
Admission APACHE II (mean) 14.8 ± 7.9 19.7 ± 8.2 18 ± 11 18.1 ± 9.1
  1. Data are expressed as mean ± standard deviation. ABC, Anemia and Blood Transfusion in Critical Care; APACHE, Acute Physiology and Chronic Health Evaluation; ICU, intensive care unit; TRICC, Transfusion Requirements in Critical Care.