Patient demographics among the study groups
| Level I | Level II | p Value | |
|---|---|---|---|
| Age (average±SD) | 33.3±13.5 | 33±12.1 | NS |
| Mechanism of injury | |||
| Motor vehicle accident | 66% | 64% | NS |
| Fall from height | 10.3% | 8% | NS |
| Penetrating | 6% | 4% | NS |
| Other | 11% | 15% | NS |
| Unknown/missing | 6.7% | 9% | NS |
| Associated injuries | |||
| Other skeletal | 61.3% | 59.9% | NS |
| Abdominal | 14.3% | 15.9% | NS |
| Chest | 24.4% | 29.2% | NS |
| Head | 19.3% | 11.5% | 0.18 |
| ISS | |||
| 9 | 46 | 50.5 | NS |
| 10–14 | 21.4 | 19.3 | NS |
| 16–24 | 11.1 | 12.8 | NS |
| 25–75 | 21.4 | 17.4 | NS |
| Associated comorbidities | 18.5% | 19% | |
NS, not significant.