Table 1:
Descriptive Statistics: Demographics and Head Injury
| No Head Injury N = 689 | Early Head Injury N = 95 | Late Head Injury N = 96 | p-value | |
|---|---|---|---|---|
| Age at Wave 1 (years) | 9.6 ± 0.6 | 9.5 ± 0.5 | 9.8 ± 0.7 | 0.014 |
| Male | 43% | 55% | 59% | 0.001 |
| Monozygotic | 46% | 42% | 41% | 0.519 |
| Race | 0.072 | |||
| White | 30% | 21% | 28% | |
| Hispanic | 35% | 43% | 46% | |
| Black | 14% | 17% | 7% | |
| Asian | 4% | 5% | 0% | |
| Mixed/Other | 17% | 14% | 19% | |
| Age at First Head Injury (years) | 4.2 ± 2.1 | 14.7 ± 3.4 | <0.001 | |
| Multiple Head Injuries | 33% | 26% | <0.001 | |
| Taken to Hospital | 80% | 62% | 0.008 | |
| Lost Consciousness | 19% | 57% | <0.001 |