Association between decreased Hb levels and clinical variables
| Variables | Hb <120 (n=53) | 120≤Hb <130 (n=46) | 130≤Hb <140 (n=55) | Hb ≥140 (n=96) | P value |
| Age, years | 53.0 (40.0, 61.0) | 54.0 (37.8, 62.8) | 53.0 (34.5, 60.0) | 36.0 (26.0, 48.3) | <0.01 |
| Male, n (%) | 24 (45.3) | 25 (54.3) | 42 (76.4) | 92 (95.8) | <0.01 |
| Blunt trauma, n (%) | 48 (90.6) | 44 (95.7) | 55 (100.0) | 93 (96.9) | 0.09 |
| HR, beats/min | 89 (73, 115) | 93 (78, 114) | 83 (73, 101) | 90 (82, 101) | 0.13 |
| SBP, mm Hg | 104 (79, 138) | 122 (101, 144) | 123 (99, 159) | 137 (119, 160) | <0.01 |
| DBP, mm Hg | 66 (39, 87) | 85 (64, 96) | 76 (59, 91) | 83 (69, 98) | 0.01 |
| RR, breaths/min | 23 (18, 26) | 23 (20, 30) | 21 (17, 27) | 23 (19, 26) | 0.38 |
| pH | 7.40 (7.29, 7.43) | 7.39 (7.34, 7.42) | 7.41 (7.36, 7.43) | 7.38 (7.35, 7.41) | 0.45 |
| Lac, mmol/L | 3.1 (2.1, 5.8) | 2.8 (1.6, 3.8) | 2.8 (1.6, 4.1) | 2.7 (1.8, 3.9) | 0.30 |
| ISS | 25 (16, 34) | 23 (14, 29) | 21 (13, 30) | 18 (10, 26) | 0.07 |
| RTS | 7.11 (5.68, 7.84) | 7.55 (6.82, 7.84) | 7.55 (6.90, 7.84) | 7.84 (7.55, 7.84) | 0.02 |
| Ps | 0.93 (0.65, 0.98) | 0.92 (0.77, 0.97) | 0.95 (0.84, 0.98) | 0.98 (0.94, 0.99) | <0.01 |
| Mortality, n (%) | 8 (15.1) | 5 (10.9) | 6 (10.9) | 4 (4.2) | 0.14 |
| Interventions, n (%) | 22 (41.5) | 14 (30.4) | 16 (29.1) | 15 (15.6) | <0.01 |
Continuous variables are shown as median (IQR).
DBP, diastolic blood pressure; Hb, hemoglobin; HR, heart rate; ISS, Injury Severity Score; Lac, lactate; Ps, probability of survival; RR, respiratory rate; RTS, revised trauma score; SBP, systolic blood pressure.