Table 1.
Descriptive Characteristics of the Study Groups
| Mild I/II TBI n=510 | Mild III TBI n=106 | Moderate/severe TBI n=113 | OI n=197 | p | |
|---|---|---|---|---|---|
| Age (months) | 110.6 | 113.8 | 109.7 | 110.92 | 0.95 |
| Mean (SD) | (67.3) | (74.6) | (76.5) | (60.8) | |
| % Male | 62.6 | 74.5 | 69.0 | 61.9 | 0.07 |
| Ethnicity (%) | <0.0001 | ||||
| Asian | 1.6 | 4.7 | 2.7 | 3.1 | |
| Black | 2.4 | 7.6 | 13.3 | 2.5 | |
| Hispanic | 8.9 | 10.4 | 15.9 | 12.2 | |
| Other | 20.7 | 12.3 | 23.0 | 16.8 | |
| White | 66.5 | 65.1 | 45.1 | 65.5 | |
| Household income (%) | <0.0001 | ||||
| <$30 k | 21.6 | 21.7 | 31.9 | 16.8 | |
| $30–60 k | 16.9 | 19.8 | 28.3 | 15.7 | |
| $60–100 k | 19.4 | 28.3 | 19.5 | 25.4 | |
| Over $100 k | 37.7 | 24.5 | 12.4 | 37.6 | |
| Unknown | 4.5 | 5.7 | 8.0 | 4.6 | |
| Mechanism of injury (%) | <0.0001 | ||||
| Motor vehicle | 7.4 | 16.4 | 35.6 | 3.2 | |
| Pedestrian | 6.6 | 11.5 | 16.4 | 2.7 | |
| Fall | 57.2 | 53.9 | 32.7 | 83.1 | |
| Struck by | 0.0 | 1.0 | 5.8 | 0.5 | |
| Other | 28.8 | 17.3 | 9.6 | 10.6 | |
| Insurance status (%) | <0.0001 | ||||
| No | 2.2 | 6.6 | 10.6 | 2.0 | |
| Medicaid | 26.3 | 18.9 | 40.7 | 25.9 | |
| Private | 69.6 | 68.9 | 44.3 | 71.1 | |
| Tricare | 0.2 | 5.7 | 3.5 | 0.0 | |
| Basic health | 1.8 | 0.0 | 0.9 | 1.0 |
TBI, traumatic brain injury; OI, orthopedic injury.