Skip to main content

Table 1 Baseline characteristics and outcomes in each blood group

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

  Type O
n = 284
Type A
n = 285
Type B
n = 209
Type AB
n = 123
p value
Characteristics
 Age, years (SD) 57.3 (20.0) 56.3 (20.0) 57.6 (19.4) 53.6 (17.8) 0.284
 Female, n (%) 64 (22.5) 61 (21.4) 55 (26.3) 26 (21.1) 0.593
 Charlson Comorbidity Index, median (IQR) 0 (0–2) 0 (0–2) 0 (0–1) 0 (0–1) 0.380
 Uncrossmatched type O RBC transfusion, n (%) 28 (9.9) 17 (6) 16 (7.7) 4 (3.3) 0.086
 RTS, mean (SD) 6.85 (1.43) 7.12 (1.18) 7.08 (1.16) 7.23 (1.03) 0.019
 ISS, median (IQR) 18 (16–25) 18 (16–25) 19 (16–25) 20 (16–25) 0.133
 AIS head, median (IQR) 4 (3–4) 4 (3–4) 4 (3–4) 4 (3–4) 0.842
 AIS face, median (IQR) 0 (0–0) 0 (0–0) 0 (0–0) 0 (0–0) 0.983
 AIS chest, median (IQR) 0 (0–2) 0 (0–3) 0 (0–3) 0 (0–3) 0.612
 AIS abdomen, median (IQR) 0 (0–0) 0 (0–0) 0 (0–0) 0 (0–0) 0.781
 AIS extremities, median (IQR) 0 (0–2) 0 (0–2) 0 (0–2) 0 (0–2) 0.681
 AIS surface, median (IQR) 0 (0–0) 0 (0–0) 0 (0–0) 0 (0–0) 0.873
Outcomes
 In-hospital mortality, n (%) 80 (28.2) 30 (10.5) 30 (14.4) 11 (8.9) < 0.001
 Death due to exsanguination, n (%) 23 (8.1) 5 (1.8) 5 (2.4) 4 (3.3) < 0.001
 Death due to TBI, n (%) 43 (15.1) 22 (7.7) 19 (9.1) 3 (2.4) < 0.001
 Death due to other causes, n (%) 14 (4.9) 3 (1.1) 6 (2.9) 4 (3.3) 0.062
 Ventilator-free days, mean (SD) 18.7 (12.2) 23.1 (9.3) 22.3 (10.2) 24.5 (8.2) < 0.001
 Units of RBCs administered within 24 h, mean (SD) 3 (11) 2 (5) 2 (10) 2 (8) 0.231
  1. Categorical variables are expressed as numbers (%); continuous variables are presented as medians (25–75 percentiles = interquartile range (IQR))
  2. We used a one-way analysis of variance to assess the differences among the four blood groups
  3. AIS Abbreviated Injury Scale; ISS Injury Severity Score; RBC red blood cell; RTS Revised Trauma Score; SD standard deviation; TBI traumatic brain injury