Table. Participant Characteristics at 5-Year Follow-up.
| Characteristic | Combat Controls (n = 45) | Concussive Blast TBI (n = 45) | P Valuea |
|---|---|---|---|
| Age, mean (SD), y | 34.4 (6.7) | 30.6 (5.3) | .004 |
| Education, mean (SD), y | 16.6 (3.4) | 13.6 (1.7) | <.001 |
| Sex, No. (%) | |||
| Male | 33 (73) | 44 (98) | .002 |
| Female | 12 (27) | 1 (2) | |
| Race/ethnicity, No. (%)b | |||
| White | 35 (78) | 32 (71) | .63 |
| Black | 3 (7) | 2 (4) | |
| Hispanic/Latino | 7 (16) | 10 (22) | |
| Asian | 0 (0) | 1 (2) | |
| Branch of service, No. (%)c | |||
| US Army | 13 (29) | 39 (87) | <.001 |
| US Air Force | 5 (11) | 0 (0) | |
| US Marine Corps | 5 (11) | 5 (11) | |
| US Navy | 22 (49) | 1 (2) | |
| Military rank, No. (%) | |||
| Enlisted | 29 (64) | 43 (96) | <.001 |
| Officer | 16 (36) | 2 (4) | |
| No. of deployments, mean (SD) | 1.5 (0.9) | 1.8 (1.2) | .22 |
| Service separation, No. (%) | 16 (36) | 27 (60) | .03 |
Abbreviation: TBI, traumatic brain injury.
a
Statistical significance by Mann-Whitney or Fisher exact test as appropriate.
b
Race/ethnicity computed as white vs other.
c
Branch of service computed as Army vs other.