Table 1.

Comparison of Demographic, Trauma, and Behavioral Variables Across Study Groups

	Comparison mean (SE)	9/11-exposed mean (SE)
Age at scan (y)	29.3 (1.4)	30.5 (2.5)
Gender	5F, 6M	5F, 6M
Age at first trauma	12.5 (1.6)	17.3 (2.6)
Years since most recent trauma	6.0 (1.7)	3.3 (.41)†
Years since worst trauma	11.7 (2.6)	4.9 (1.3)*
Number of traumas in lifetime	6.6 (2.7)	4.4 (0.7)
Number of traumas in lifetime with shock/horror	3.4 (0.9)	3.4 (0.6)
Total number of symptoms at worst trauma	3.2 (1.1)	7.4 (1.2)*
Number intrusion symptoms at worst trauma	1.2 (0.5)	2.2 (0.4)
Number of avoidance symptoms at worst trauma	0.8 (0.4)	2.3 (0.5)*
Number of arousal symptoms at worst trauma	1.2 (0.5)	2.8 (0.5)*
IES	15.7 (0.5)	22.3 (2.6)*
IES subscale (intrusion)	7.8 (0.4)	10.8 (1.2)*
IES subscale (avoidance)	8.1 (0.1)	11.4 (1.6)*
State-Trait Anxiety Inventory	30.1 (1.1)	28.5 (2.0)
History of posttraumatic stress disorder in lifetime	0.2 (0.1)	0.3 (0.1)

Note. F = female; M = male; IES = Impact of Events Scale. n = 11 in each group, except for trauma variables (where n[comparison] = 10).

^*p < .05.

^†p < .10.