Study assigned blast grouping | Overall (n = 307) | No blast (n = 208) | Single mild (n = 52) | Multiple mild (n = 47) | ||||
---|---|---|---|---|---|---|---|---|
Blast characteristics | n | % | n | % | n | % | n | % |
Proximity to Blast | ||||||||
 Not applicable | 153 | 49.8 | 140 | 67.3 | 7 | 13.5 | 6 | 12.8 |
 < 50 m | 97 | 31.6 | 24 | 11.5 | 40 | 76.9 | 33 | 70.2 |
 50–100 m | 19 | 6.2 | 12 | 5.8 | 1 | 1.9 | 6 | 12.8 |
 101–200 m | 7 | 2.3 | 5 | 2.4 | 2 | 3.8 | 0 | 0.0 |
 > 200 m | 19 | 6.2 | 15 | 7.2 | 2 | 3.8 | 2 | 4.3 |
 Missing data | 12 | 3.9 | 12 | 5.8 | 0 | 0.0 | 0 | 0.0 |
Number of sub-concussive blasts | ||||||||
 Not applicable | 71 | 23.1 | 70 | 33.7 | 0 | 0.0 | 1 | 2.1 |
 0 | 89 | 29.0 | 62 | 29.8 | 17 | 32.7 | 10 | 21.3 |
 1 | 11 | 3.6 | 6 | 2.9 | 4 | 7.7 | 1 | 2.1 |
 > 1 | 111 | 36.2 | 45 | 21.6 | 31 | 59.6 | 35 | 74.5 |
 Missing data | 25 | 8.1 | 25 | 12.0 | 0 | 0.0 | 0 | 0.0 |
Number of concussive blasts | ||||||||
 0 | 208 | 67.8 | 208 | 100.0 | 0 | 0.0 | 0 | 0.0 |
 1 | 52 | 16.9 | 0 | 0.0 | 52 | 100.0 | 0 | 0.0 |
 2 | 12 | 3.9 | 0 | 0.0 | 0 | 0.0 | 12 | 25.5 |
 ≥ 3 | 35 | 11.4 | 0 | 0.0 | 0 | 0.0 | 35 | 74.5 |
 Missing data | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 |
TBI symptoms | ||||||||
 Absent | 208 | 67.8 | 208 | 100.0 | 0 | 0.0 | 0 | 0.0 |
 Mild | 98 | 31.9 | 0 | 0.0 | 52 | 100.0 | 46 | 97.9 |
 Moderate | 1 | 0.3 | 0 | 0.0 | 0 | 0.0 | 1 | 2.1 |
 Missing data | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 |
PTSD associated with blast | ||||||||
 Not applicable | 31 | 10.1 | 24 | 11.5 | 4 | 7.7 | 3 | 6.4 |
 Yes | 26 | 8.5 | 9 | 4.3 | 12 | 23.1 | 5 | 10.6 |
 Maybe | 61 | 19.9 | 25 | 12.0 | 16 | 30.8 | 20 | 42.6 |
 No | 102 | 33.2 | 66 | 31.7 | 18 | 34.6 | 18 | 38.3 |
 Missing data | 87 | 28.3 | 84 | 40.4 | 2 | 3.8 | 1 | 2.1 |
Blast related symptoms or injury* | ||||||||
 Not applicable | 198 | 64.5 | 171 | 82.2 | 15 | 28.8 | 12 | 25.5 |
 Primary | 30 | 9.8 | 6 | 2.9 | 11 | 21.2 | 13 | 27.7 |
 Secondary | 6 | 2.0 | 1 | 0.5 | 3 | 5.8 | 2 | 4.3 |
 Tertiary | 25 | 8.1 | 3 | 1.4 | 13 | 25.0 | 9 | 19.1 |
 Quaternary | 23 | 7.5 | 2 | 1.0 | 10 | 19.2 | 11 | 23.4 |
 Missing data | 25 | 8.1 | 25 | 12.0 | 0 | 0.0 | 0 | 0.0 |
Physically moved by blast | ||||||||
 Not applicable | 89 | 29.0 | 88 | 42.3 | 0 | 0.0 | 1 | 2.1 |
 Yes | 45 | 14.7 | 5 | 2.4 | 23 | 44.2 | 17 | 36.2 |
 No | 147 | 47.9 | 89 | 42.8 | 29 | 55.8 | 29 | 61.7 |
 Missing data | 26 | 8.5 | 26 | 12.5 | 0 | 0.0 | 0 | 0.0 |