Distribution of demographic and injury characteristics among 80 study subjects, 62 subjects without ε4 allele, and 18 subjects with ε4 allele
| Characteristics | Study population, n = 80 | All eligible subjects, n = 315, % | APOE ε4-negative, n = 62, % | APOE ε4-positive, n = 18, % | ||
|---|---|---|---|---|---|---|
| n | % | |||||
| Sex | ||||||
| M | 48 | 60.0 | 64.2 | 56.5 | 72.2 | |
| F | 32 | 40.0 | 35.8 | 43.5 | 27.8 | |
| Age, y | ||||||
| <30 | 25 | 31.2 | 35.6 | 33.9 | 22.2 | |
| 30–49 | 28 | 35.0 | 34.0 | 32.2 | 50.0 | |
| ≥50 | 27 | 33.8 | 30.4 | 33.9 | 27.8 | |
| Race/ethnicity | ||||||
| White | 65 | 81.2 | — | 80.6 | 83.3 | |
| Other | 15 | 18.8 | — | 19.4 | 16.7 | |
| Highest educational level completed | ||||||
| <High school | 15 | 18.8 | — | 21.0 | 11.1 | |
| High school | 24 | 30.0 | — | 29.0 | 33.3 | |
| Some college | 23 | 28.7 | — | 33.8 | 11.1 | |
| College | 8 | 10.0 | — | 8.1 | 16.7 | |
| Graduate school | 10 | 12.5 | — | 8.1 | 27.8 | |
| Preinjury employment status | ||||||
| Employed, full-time | 52 | 59.8 | — | 71.0 | 38.9 | |
| Employed, part-time | 8 | 9.2 | — | 8.1 | 16.7 | |
| Retired | 12 | 13.8 | — | 12.9 | 22.2 | |
| Not employed | 7 | 8.0 | — | 6.4 | 16.7 | |
| Student, full-time | 1 | 1.1 | — | 1.6 | 5.5 | |
| Glasgow Coma Scale | ||||||
| 15 | 32 | 40.0 | 36.8 | 41.9 | 33.3 | |
| 13–14 | 40 | 50.0 | 44.3 | 50.0 | 50.0 | |
| 9–12 | 8 | 8.0 | 18.9 | 8.1 | 16.7 | |
| CT scan results | ||||||
| Negative | 36 | 45.0 | 52.7 | 48.4 | 33.3 | |
| Positive | 44 | 55.0 | 47.3 | 51.6 | 66.7 | |
| Mechanism of injury | ||||||
| Motor vehicle accident | 47 | 58.8 | 54.5 | 59.7 | 55.6 | |
| Fall | 18 | 22.5 | 22.7 | 22.6 | 22.2 | |
| Assault | 3 | 3.7 | 5.8 | 3.2 | 5.6 | |
| Other | 12 | 15.0 | 17.0 | 14.5 | 16.6 | |
| Loss of consciousness | ||||||
| No/unknown | 16 | 20.0 | 22.3 | 17.7 | 27.8 | |
| Yes | 64 | 80.0 | 77.7 | 82.3 | 72.2 | |