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Table 2 The comparison of characteristics and outcomes between blood type O and other blood types

From: The impact of blood type O on mortality of severe trauma patients: a retrospective observational study

  Type O
n = 284
Non-O type
n = 617
p value
Characteristics
 Age, years (SD) 57.3 (20.0) 56.2 (19.4) 0.442
 Female, n (%) 64 (22.5) 142 (23) 0.873
 Charlson Comorbidity Index, median (IQR) 0 (0–2) 0 (0–1) 0.829
 Uncrossmatched type O RBC transfusion, n (%) 28 (9.9) 37 (6) 0.051
 RTS, (SD) 6.85 (1.4) 7.13 (1.2) 0.003
 ISS, median (IQR) 18 (16–25) 19 (16–25) 0.160
 AIS head, median (IQR) 4 (3–4) 4 (3–4) 0.582
 AIS face, median (IQR) 0 (0–0) 0 (0–0) 0.783
 AIS chest, median (IQR) 0 (0–2) 0 (0–3) 0.342
 AIS abdomen, median (IQR) 0 (0–0) 0 (0–0) 0.561
 AIS extremities, median (IQR) 0 (0–2) 0 (0–2) 0.443
 AIS surface, median (IQR) 0 (0–0) 0 (0–0) 0.652
Outcomes
 In-hospital mortality, n (%) 80 (28.2) 71 (11.5) < 0.001
 Death due to exsanguination, n (%) 23 (8.1) 15 (2.4) < 0.001
 Death due to TBI, n (%) 43 (15.1) 44 (7.1) < 0.001
 Death due to other causes, n (%) 15 (1.8) 11 (5.3) 0.005
 Ventilator-free days, mean (SD) 18.7 (12.2) 23.1 (9.4) < 0.001
 Units of RBCs administered within 24 h, mean (SD) 3 (9) 2 (7) 0.112
  1. Categorical variables are expressed as numbers (%); continuous variables are presented as medians (25–75 percentiles = interquartile range (IQR))
  2. AIS Abbreviated Injury Scale; ISS Injury Severity Score; RBC red blood cell; RTS Revised Trauma Score; SD standard deviation; TBI traumatic brain injury