Table 1 Univariate analysis of predicting factors for transfusion
From: Intelligent prediction of RBC demand in trauma patients using decision tree methods
Variable | No-transfusion (n = 1183) | Transfusion (n = 188) | P-value |
|---|---|---|---|
Age [year, median (range)] | 44.00 (29.00, 56.50) | 42.00 (28.00, 54.25) | 0.049 |
Gender [n (%)] | Â | Â | 0.468 |
 Female | 284 (24.0) | 40 (21.3) |  |
 Male | 899 (76.0) | 148 (78.7) |  |
Height [cm, median (range)]* | 170.00 (164.00, 175.00) | 170.00 (163.50, 173.25) | 0.242 |
Weight [kg, median (range)]* | 68.00 (60.00, 75.00) | 67.75 (60.00, 76.00) | 0.541 |
Non-invasive parameters | |||
 HR [beat/min, mean (SD)]* | 96.95 (24.31) | 103.55 (25.87) | 0.000 |
 R [beat/min, median (range)]* | 21.00 (19.00, 23.00) | 21.00 (19.00, 26.00) | 0.071 |
 SBP [mmHg, mean (SD)]* | 124.32 (25.28) | 117.65 (27.46) | 0.000 |
 DBP [mmHg, mean (SD)]* | 77.58 (15.96) | 74.62 (17.83) | 0.000 |
 SpO2 [%, median (range)]* | 98.00 (96.00, 99.00) | 98.00 (96.00, 99.00) | 0.113 |
 SI [mean (SD)]* | 0.82 (0.29) | 0.95 (0.43) | 0.000 |
 T [°C, median (range)]* | 37.00 (36.80, 37.30) | 37.00 (36.70, 37.30) | 0.389 |
Invasive detection parameters | |||
 Hb [g/L, median (range)]* | 126.00 (107.00, 143.00) | 107.00 (82.00, 135.00) | 0.000 |
 Hct [L/L, median (range)]* | 3.80 (0.50, 22.00) | 0.46 (0.25, 4.00) | 0.000 |
 PLT [× 109/L, mean (SD)]* | 216.81 (94.70) | 201.76 (99.53) | 0.000 |
 CRP [mg/L, median (range)]* | 0.95 (0.10, 4.87) | 0.41 (0.10, 3.41) | 0.806 |
 IL-6 [pg/ml, mean (SD)]* | 182.37 (380.08) | 219.26 (388.41) | 0.412 |
 PT [s, median (range)]* | 14.70 (14.00, 16.00) | 15.40 (14.20, 17.08) | 0.000 |
 APTT [s, mean (SD)]* | 37.03 (10.39) | 38.50 (12.86) | 0.000 |
 INR [median (range)]* | 15.40 (14.60, 16.40) | 15.60 (14.60, 16.60) | 0.698 |
 PTA [%, median (range)]* | 80.00 (68.00, 89.00) | 73.50 (61.25, 85.00) | 0.000 |
 Fib [g/L, mean (SD)]* | 3.15 (1.76) | 2.72 (1.51) | 0.000 |
 pH [median (range)]* | 1.16 (1.08, 1.28) | 1.22 (1.11, 1.39) | 0.000 |
 PO2 [mmHg, mean (SD)]* | 120.73 (62.16) | 134.12 (73.88) | 0.001 |
 PCO2 [mmHg, median (range)]* | 37.00 (33.00, 41.00) | 37.00 (32.00, 41.00) | 0.116 |
 TCO2 [mmol/L, mean (SD)]* | 24.01 (4.38) | 22.66 (4.85) | 0.000 |
 Lac [mmol/L, median (range)]* | 7.41 (7.37, 7.45) | 7.39 (7.35, 7.43) | 0.000 |
 AB [mmol/L, mean (SD)]* | 22.88 (4.24) | 21.54 (4.73) | 0.000 |
 SB [mmol/L, mean (SD)]* | 23.69 (3.56) | 22.39 (4.31) | 0.000 |
 K [mmol/L, median (range)]* | 3.88 (3.56, 4.10) | 3.90 (3.60, 4.24) | 0.008 |
Endotracheal intubation [n (%)] | Â | Â | 0.011 |
 No | 1003 (84.8) | 145 (77.1) |  |
 Yes | 180 (15.2) | 43 (22.9) |  |
Vasoactive drugs [n (%)] | Â | Â | 0.000 |
 No | 1113 (94.1) | 151 (80.3) |  |
 Yes | 70 (5.9) | 37 (19.7) |  |
Trauma location [n (%)] | Â | Â | 0.000 |
 Upper extremity | 21 (1.8) | 3 (1.6) |  |
 Lower extremity | 42 (3.6) | 7 (3.7) |  |
 Head and neck | 386 (32.6) | 28 (14.9) |  |
 Chest and abdomen | 538 (45.5) | 101 (53.7) |  |
 Spine | 62 (5.2) | 13 (6.9) |  |
 Trunk | 20 (1.7) | 7 (3.7) |  |
 Pelvis | 57 (4.8) | 22 (11.7) |  |
 NA | 57 (4.8) | 7 (3.7) |  |
Trauma severity classification [n (%)] | Â | Â | 0.529 |
 First level | 999 (84.4) | 163 (86.7) |  |
 Second level | 179 (15.1) | 25 (13.3) |  |
 Third level | 5 (0.4) | 0 |  |
Trauma type [n (%)] | Â | Â | 0.921 |
 Open trauma | 747 (63.1) | 120 (63.8) |  |
 Blunt injury | 436 (36.9) | 68 (36.2) |  |
RBC volume [U, median (range)] | 0.00 | 2.00 [0.00, 4.00] | 0.000 |
24 h RBC [U, median (range)] | 0.00 | 2.00 [0.00, 4.00] | 0.000 |
Emergency department time [h, mean (SD)] | 23.58 (33.69) | 25.61 (37.80) | 0.001 |