Table 2.
History of prior head injury.
| Variables | Breachers/range staff (n = 19) | CAF controls (n = 19) | Mean difference (95% CI) | Bootstrap ratio | P |
|---|---|---|---|---|---|
| Concussion | 8 (44.4) | 5 (26.3) | 21 (−5.3–47.4) | 1.5 | 0.088 |
| Physical impact to head | 9 (47.4) | 11 (57.9) | −10.4 (−36.8–15.8) | 0.7 | 0.402 |
| MVA | 14 (73.7) | 9 (47.4) | 2.6 (−5.3–52.6) | 1.7 | 0.066 |
| Fallen as child | 8 (42.1) | 6 (31.6) | 10.4 (−10.5–31.6) | 1 | 0.206 |
| Physical fight | 13 (68.4) | 15 (78.9) | −10.6 (−31.6–15.8) | 0.9 | 0.258 |
| Blast exposure | 19 (100) | 2 (10.5) | 89.2 (73.7–100) | 12.5 | <0.001 |
CAF, Canadian Armed Forces; MVA, motor vehicle accident. Data presented as the frequency and (%). Significance corrected at a false discovery rate of p = 0.05 (bold p-values), derived from bootstrapped mean difference testing evaluated on the percent of individuals categorized to each outcome (see section Method).