Table 1:

Bivariate associations of pre-deployment factors and deployment-acquired TBI with binge drinking and heavy drinking at T2 and T3 among Army STARRS Pre/Post Deployment Survey respondents (n=4,645) weighted percentages^a

	Size of sub-group n (weighted percent)	Drinking Outcomes at T2		Drinking Outcomes at T3
		Binge Drinking n = 2438 (52.5%)	Heavy Drinking n = 1230 (26.1%)	Binge Drinking n = 1924 (41.3%)	Heavy Drinking n = 1052 (22.3%)
Lifetime TBIb at T0	1551 (34.3%)	958 (62.0%)***	507 (32.3%)***	741 (47.9%)***	397 (25.3%)***
Lifetime Mental Health Diagnosis at T0	1982 (43.4%)	1201 (61.0%)***	677 (34.0%)***	962 (48.5%)***	572 (28.6%)***
Past-month Binge Drinking at T0	2418 (52.5%)	1776 (73.4%)***	987 (40.5%)***	1389 (57.7%)***	783 (32.2%)***
Deployment-acquired TBIc at T1	898 (19.2%)	494 (55.4%)	271 (30.0%)**	423 (46.6%)***	246 (27.2%)***

^aWeighted percentages are shown to display policy relevant findings. The table shows unweighted numbers. Chi-square test significance are displayed for each bivariate association.

^bLifetime TBI was defined as at least 1 TBI with a loss of consciousness prior to the index deployment.

^cDA-TBI was defined as any endorsement (yes/no) of 1 or more head, neck, or blast injuries during the index deployment that led to alteration of consciousness, loss of consciousness, or posttraumatic amnesia of any duration.

^*p≤.05;

^**p≤.01;

^***p≤.001

Note. TBI = traumatic brain injury. The analysis sample is comprised of baseline Pre/Post Deployment Survey respondents who deployed to Afghanistan and completed all follow-up surveys. Lifetime TBI, lifetime mental health diagnosis (includes alcohol or substance use disorder), and past-month binge drinking were assessed 1–2 months prior to the index deployment (T0). Deployment-acquired TBI was assessed within one month of return from deployment (T1). Drinking outcomes were assessed 3 months (T2) and 9 months (T3) after return from deployment.