Table 4 Significant covariates of the trauma patients with and without AKI before and after propensity score matching (1:1 greedy matching)
From: Post-traumatic acute kidney injury: a cross-sectional study of trauma patients
| Â | Before matching | After matching | ||||||
|---|---|---|---|---|---|---|---|---|
Variables | AKI n = 78 | Non-AKI n = 14426 | Odds ratio (95%) | P | AKI n = 71 | Non-AKI n = 71 | Odds ratio (95%) | P |
Gender | ||||||||
 Male | 56 (71.8) | 8267 (57.3) | 1.9 (1.16–3.11) | 0.010 | 51 (71.8) | 51 (71.8) | 1.0 (0.48–2.08) | 1.000 |
 Female | 22 (28.2) | 6159 (42.7) | 0.5 (0.32–0.86) | 0.010 | 20 (28.2) | 20 (28.2) |  |  |
Age | 62.9 ± 21.0 | 52.7 ± 19.2 | — | <0.001 | 62.9 ± 21.4 | 62.3 ± 21.4 | — | 0.869 |
Comorbidity | ||||||||
 DM | 20 (25.6) | 2087 (14.5) | 2.0 (1.22–3.40) | 0.005 | 18 (25.4) | 18 (25.4) | 1.0 (0.47–2.13) | 1.000 |
 HTN | 36 (46.2) | 3928 (27.2) | 2.3 (1.47–3.58) | <0.001 | 31 (43.7) | 31 (43.7) | 1.0 (0.52–1.94) | 1.000 |
 CAD | 9 (11.5) | 494 (3.4) | 3.7 (1.83–7.41) | 0.001 | 7 (9.9) | 7 (9.9) | 1.0 (0.33–3.02) | 1.000 |
 CVA | 7 (9.0) | 569 (3.9) | 2.4 (1.10–5.24) | 0.035 | 5 (7.0) | 5 (7.0) | 1.0 (0.28–3.62) | 1.000 |
GCS | 11.5 ± 4.8 | 14.3 ± 2.3 | — | <0.001 | 11.9 ± 4.6 | 12.1 ± 4.6 | — | 0.784 |
AIS, n (%) | ||||||||
 Head/Neck | 35 (44.9) | 3766 (26.1) | 2.3 (1.47–3.61) | <0.001 | 34 (47.9) | 34 (47.9) | 1.0 (0.52–1.93) | 1.000 |
 Thorax | 17 (21.8) | 1610 (11.2) | 2.2 (1.29–3.81) | 0.003 | 14 (19.7) | 14 (19.7) | 1.0 (0.44–2.29) | 1.000 |
 Abdomen | 11 (14.1) | 851 (5.9) | 2.6 (1.38–4.97) | 0.006 | 10 (14.1) | 10 (14.1) | 1.0 (0.39–2.57) | 1.000 |
 Extremity | 41 (52.6) | 10792 (74.8) | 0.4 (0.24–0.58) | <0.001 | 40 (56.3) | 40 (56.3) | 1.0 (0.52–1.94) | 1.000 |
ISS | 19.8 ± 17.3 | 8.9 ± 7.2 | — | <0.001 | 18.3 ± 15.2 | 18.1 ± 15.2 | — | 0.960 |
SBP <90 mmHg | 6 (7.7) | 332 (2.3) | 3.5 (1.53–8.19) | 0.010 | 5 (7.0) | 6 (8.5) | 0.8 (0.24–2.82) | 0.754 |