Table 1.
Demographic and clinical characteristics.
| Breacher (N = 20) | Matched controls (N = 14) | Significance | |
|---|---|---|---|
| Race, no. (%) | χ2 = 2.893, p = 0.576 | ||
| White | 17 (85) | 12 (85.71) | |
| Black | 0 (0) | 1 (7.14) | |
| Asian/pacific islander | 1 (5) | 1 (7.14) | |
| American Indian/Alaskan | 1 (5) | 0 (0) | |
| Other | 1 (5) | 0 (0) | |
| Ethnicity (Non-Hispanic), no. (%) | 19 (95) | 13 (92.86) | χ2 = 0.068, p = 0.794 |
| Sex (male), no. (%) | 20 (100) | 14 (100) | N/A |
| Type of service, no. (%) | χ2 = 0.336, p = 0.562 | ||
| Military | 13 (65) | 10 (71.43) | |
| Civilian law enforcement | 4 (20) | 4 (28.57) | |
| Both | 3 (15) | 0 (0) | |
| Mean age in years (SD) | 39.65 (8.337) | 38.86 (7.814) | t = 0.280, p = 0.781 |
| Mean years of education (SD) | 14.25 (1.743) | 14.43 (2.593) | t = −0.241, p = 0.811 |
| Mean years of service (SD) | 16.80 (6.693) | 13.92 (6.986) | t = 1.209, p = 0.235 |
| Most recent blast exposure, no. (%) | χ2 = 29.046, p < 0.01 | ||
| Never | 0 (0) | 11 (78.57) | |
| Past week | 4 (20) | 0 (0) | |
| Past month | 8 (40) | 0 (0) | |
| Past 6 months | 3 (15) | 0 (0) | |
| Past year | 3 (15) | 0 (0) | |
| More than 1 year | 2 (5) | 3 (21.43) | |
| Mean number of self-reported head injuries (SD) | 0.80 (0.616) | 0.36 (0.497) | t = 2.228, p = 0.033 |
| PCL-M | 25.55 (6.924) | 20.64 (4.483) | t = 2.327, p = 0.027 |
| RPQ scores | |||
| Total RPQ | 11.95 (11.928) | 6.93 (6.158) | t = 1.436, p = 0.161 |
| RPQ-3 | 1.53 (2.065) | 0.21 (0.426) | t = 2.332, p = 0.026 |
| RPQ-13 | 10.42 (10.772) | 6.71 (6.207) | t = 1.151, p = 0.258 |