Table 2.

TBI and Injury Event Exposures, In Past Year Combat Deployment Sample (N= 7,155), weighted percentages ^a,^b

Injury Event Exposurec	Sample N (% and Population Estimates)	Self-Report TBI Level of those with Exposure
		No TBI	Altered Consciousness	LOC< 1 Minute	LOC 1+ Minutes	Total of Exposure Group
Blast/explosion exposure only	653 (9.7%, 35,948)	567 (83.0%)	57 (11.9%)	21 (3.6%)	8 (1.5%)	100%
Other injury etiologies onlyd	740 (9.8%, 40,737)	562 (75.2%)	109 (14.2%)	41 (6.0%)	28 (4.7%)	100%
Blast/explosion AND other injury etiologiesd	1,107 (19.8%, 60,941)	613 (50.7%)	257 (25.1%)	124 (12.9%)	113 (11.3%)	100%
Subtotal with Exposure (%and Population Estimates)	N = 2,500 39.4%, (137,625)	N = 1,742 (86.1%) 95,897	N = 423 (7.5%) 23,286	N = 186 (3.5%) 10,239	N = 149 (2.8%) 8,202	100%
No exposure	4,655e (60.6%, 256,259)
Total Population Estimate	7,155 (100%, 393,884)

Abbreviations: LOC, loss of consciousness

^aThe table shows unweighted N’s and weighted percentages. Sums may not add to 100% due to rounding.

^bResults were significant at the p≤.0001 level. The p-value was calculated with the use of a design-based F test.

^cPopulation estimates for a subpopulation of active duty service members returning from a combat deployment in the past year (population N is 393,884).

^dVehicular accident/crash, fragments wound above the shoulders, bullet wound above the shoulders, falls, and ‘other’ self-reported events.

^e396 service members in the sample had missing injury event data. These missing data were imputed to become zeros (rather than missing data), which decreases the weighted percentages of those with TBI slightly.