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Table 1 Multicenter observational studies of transfusion in general ICU patients

From: Red blood cell transfusion in the critically ill patient

Author Year study was conducted Country/region No. of patients and number of ICUs Percentage transfused in ICU Pretransfusion hemoglobin level Mean no. of units transfused in ICU Mean age of blood (days)
Hebert et al. [9] 1993 Canada 5,298 patients in 6 ICUs 25.0 Mean: 8.6 ± 1.3 g/dl NS NS
Vincent et al. [3] 1999 Western Europe 3,534 patients in 146 ICUs 37.0 Mean: 8.4 ± 1.3 g/dl 4.8 ± 5.2 16.2 ± 6.7
Rao et al. [6] 1999 UK 1,247 patients in 9 ICUs 53.0 Median: 8.5 (IQR: 7.9-9) g/dl 6.75 (hemorrhage) and 4.25 (anemia) NS
Corwin et al. [5] 2000 - 2001 USA 4,892 patients in 284 ICUs 44.0 Mean: 8.6 ± 1.7 g/dl 4.6 ± 4.9 21 ± 11.4
Walsh et al. [7] 2001 UK (Scotland) 1,023 patients in 10 ICUs 39.5 Median: 7.8 (7.3-8.5) g/dl Mean: 1.87 unit/ICU admission NS
French et al. [10] 2001 Australia and New Zealand 1,808 patients in 18 ICUs 19.8 Median: 8.2 (range: 4.4-18.7) g/dl Mean: 4.18 NS
Vincent et al. [34] 2002 Western and Eastern Europe 3,147 patients in 198 ICUs 33.0 Median: 8.2 g/dl 5.0 ± 5.8 NS
Westbrook et al. [8] 2008 Australia and New Zealand 5,128 patients in 47 ICUs 14.7 Mean: 7.7 g/dl Median: 2 (IQR: 1-4) Median: 14 (IQR: 9.5-21.5)
  1. ICU intensive care unit; NS not specified; IQR interquartile range
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