Patient characteristics stratified by OIS renal injury grade
| Grade ≤3 n=63 | Grades 4 and 5 n=52 | P value | |
| Age, years | 14 (10; 16) | 12 (9; 15) | 0.110 |
| Male gender, n (%) | 45 (71.4) | 33 (63.5) | 0.363 |
| ISS | 26 (14; 34) | 17 (16; 21) | 0.167 |
| TRISS 09 Ps | 0.98 (0.95; 0.99) | 0.99 (0.99; 0.99) | 0.017 |
| Transfused, n (%) | 9 (14.3) | 4 (7.7) | 0.377 |
| ED surgery, n (%) | 2 (3.2) | 1 (1.9) | 1.000 |
| Mortality, n (%) | 6 (9.5) | 1 (1.9) | 0.126 |
| Isolated injury, n (%) | 10 (15.9) | 26 (50.0) | <0.001 |
| Concomitant IAI, n (%) | 9 (14.3) | 10 (19.2) | 0.616 |
| Concomitant EAI, n (%) | 44 (69.8) | 16 (30.8) | <0.001 |
| Cystoscopy with stent, n (%) | 1 (1.6) | 5 (9.6) | 0.090 |
| Angioembolization, n (%) | 0 (0.0) | 5 (9.6) | 0.017 |
| Nephrectomy, n (%) | 1 (1.6) | 3 (5.8) | 0.327 |
| Gross hematuria, n (%) | 13 (20.6) | 40 (76.9) | <0.001 |
| Primary admission at OUH, n (%) | 25 (39.7) | 16 (30.8) | 0.321 |
| LOS ICU, days | 2 (2; 5) | 2 (1; 2) | 0.014 |
| LOS hospital, days | 5 (3; 7) | 5 (4; 7) | 0.570 |
Isolated injury refers to isolated renal injury. Values are median and interquartiles when not stated otherwise.
EAI, extra-abdominal injury; ED, emergency department; IAI, intra-abdominal injury; ICU, intensive care unit; ISS, Injury Severity Score; LOS, length of stay; OIS, Organ Injury Scale; OUH, Oslo University Hospital; TRISS 09 Ps, Trauma and Injury Severity Score 2009 revision Probability of survival.