Subgroup classification of the incidental group
| Class 1 | Class 2 | Class 3 | p Value | |
| N | 53 | 207 | 125 | |
| Age (years) | 45.3±27.3 | 62.3±20.7 | 68.4±18.8 | <0.0001 |
| Elderly, ≥65 years | 19 (35.8) | 108 (52.2) | 77 (61.6) | 0.0067 |
| Injury severity score | 15.2±9.6 | 15.4±8.7 | 14.5±10.9 | 0.2144 |
| Trauma classification | 0.3015 | |||
| Fall | 24 (45.3) | 126 (60.9) | 88 (70.4) | |
| Motor vehicle accident | 20 (37.7) | 55 (26.6) | 24 (19.2) | |
| Pedestrian | 2 (3.8) | 5 (2.4) | 2 (1.6) | |
| Assault | 4 (7.5) | 10 (4.8) | 2 (1.6) | |
| Gunshot wound | 0 | 1 (0.5) | 0 | |
| Stab | 3 (5.7) | 10 (4.8) | 9 (7.2) | |
| Trauma type | 0.165 | |||
| Blunt | 50 (94.3) | 204 (98.6) | 124 (99.2) | |
| Penetrating | 1 (1.9) | 2 (1) | 0 | |
| Other | 2 (3.8) | 1 (0.48) | 1 (0.8) | |
| Discharge disposition | 0.9449 | |||
| Home | 31 (58.5) | 101 (48.8) | 55 (44) | |
| Rehab unit | 13 (24.5) | 47 (22.7) | 34 (27.2) | |
| Death | 5 (9.4) | 18 (8.7) | 14 (11.2) | |
| Skilled nursing facility | 2 (3.8) | 18 (8.7) | 10 (8) | |
| Against medical advice | 0 (0) | 4 (1.9) | 3 (2.4) | |
| Psychiatric unit | 1 (1.9) | 1 (0.48) | 1 (0.8) | |
| Other | 1 (1.9) | 18 (8.7) | 8 (6.4) | |
| ICU admission required | 20 (37.7) | 69 (33.3) | 40 (32) | 0.7574 |
| Hospital length of stay | 7.2±6.9 | 9.0±11 | 9.8±17 | 0.1206 |
Categorical data are presented as number (%) and continuous data as mean±SD.
ICU, intensive care unit.