Table 2.
Demographic and military characteristics of the study population.
| Exposed (n = 50,254) | Unexposed (n = 50,254) | Adjusted RR* | 95% CI | |
|---|---|---|---|---|
| % | % | |||
| Race at entry | ||||
| White (ref) | 83.54 | 66.95 | 1.00 | – |
| Black | 10.73 | 26.19 | 0.52 | 0.50–0.53 |
| Other | 5.73 | 6.86 | 0.81 | 0.78–0.85 |
| Education at entry | ||||
| < HS | 1.02 | 0.90 | 1.06 | 0.97–1.17 |
| HS Diploma/GED (ref) | 81.98 | 84.58 | 1.00 | – |
| Some college | 10.21 | 9.20 | 1.09 | 1.06–1.12 |
| Bachelor's or higher | 5.97 | 4.28 | 1.21 | 1.16–1.26 |
| Missing | 0.82 | 1.05 | – | – |
| Occupation at entry | ||||
| Cannon crewmember | 43.48 | – | – | – |
| Combat engineer | 20.38 | – | – | – |
| Special forces | 20.01 | – | – | – |
| EOD specialist | 12.89 | – | – | – |
| Indirect fire infantry | 3.24 | – | – | – |
| Quartermaster | – | 29.13 | – | – |
| Field mechanical maintenance | – | 21.40 | – | – |
| Signal | – | 13.95 | – | – |
| Motor transport operator | – | 11.05 | – | – |
| Military intelligence | – | 10.99 | – | – |
| Military police | – | 7.32 | – | – |
| CBRN specialist | – | 2.24 | – | – |
| Engineers other than combat | – | 1.97 | – | – |
| FA radar operator/surveyor | – | 1.01 | – | – |
| Dog handler | – | 0.56 | – | – |
| Psychological operations | – | 0.40 | – | – |
| Deployment count | ||||
| 0 | 41.91 | 41.91 | – | – |
| 1 | 33.02 | 35.46 | – | – |
| 2 | 15.75 | 14.59 | – | – |
| 3+ | 9.32 | 8.04 | – | – |
|
Time in years to first deployment (mean ± SD) |
1.75 ± 1.21 | 1.90 ± 1.42 | 0.95 | 0.94–0.95 |
|
Total months deployed (mean ± SD) |
15.23 ± 10.04 | 14.77 ± 9.56 | 1.01 | 1.00–1.01 |
|
Years in service (mean ± SD) |
4.54 ± 3.12 | 4.87 ± 3.19 | 0.98 | 0.97–0.98 |
HS, high school; EOD, explosive ordinance disposal; FA, field artillery; CBRN, chemical, biological, radiological, nuclear.
*
Adjusted models control for race and education at military entry.