Table 1.

Sample demographics at time of structural magnetic resonance (MRI) brain imaging (Time 2)

Variable	Mean (SD) or N (%)
Age (Time 1)	38 years (SD=2.7); range 32–44
Age (Time 2)	61.8 years (SD 2.4); range 56–67
Lifetime education	13.8 (SD 2.1); Associates degree/some college
Lifetime main occupation	5.5 (SD 1.8); Small business owner
Own income	5.5 (SD 2.9); $50,000-$59,999 per year
Center for Epidemiologic Studies-Depression	6.5 (SD 7.4)
Ethnicity (non-Hispanic White)	361 (87.4%)
Childhood trauma (# events rated as severe)
0 events	325 (78.9%)
1 event	57 (13.8%)
>1 event	30 (7.3%)
Time 1 PTS symptoms	22.7 (SD 7.8); range 13–57 out of 65
Time 2 PTS symptoms	25.0 (SD 9.6); range 17–74 out of 85
Combat exposures (# types of exposures)
Not in South East Asia	266 (64.4%)
In South East Asia, no exposure	33 ( 7.9%)
1–5 exposures	77 (18.6%)
6–16 exposures	37 ( 8.9%)
Recent life events (past 2 years)	9.0 (SD 7.6); range 0–55
APOE ε 4 carrier	100 (24.9%)
Alcohol drinks in past 2 weeks
None	175 (36%)
<= 1 per day	213 (44%)
>1 but <2 per day	38 (8%)
2 to <3 per day	25 (5%)
>= 3 per day	38 (8%)
Ever smoked	249 (60.3%)
Chronic health conditions (# of conditions)
0 conditions	105 (25.4%)
1 condition	176 (42.6%)
2 conditions	83 (20.1%)
>2 conditions	49 (11.9%)
Any traumatic head injury with loss of consciousness	105 (25%)