Table 3.

Linear regression: dissociation, the Big Five, previous trauma and war-zone stress association with development of post-deployment post-traumatic stress disorder (PTSD) 2.5 years after homecoming (n = 533).

Variable	β	SE	t	p	R2
Step 1
Danger–Injury	0.02	0.12	0.31	0.76	0.164
Previous trauma	0.33	0.06	6.55	0.00*
Neuroticism	0.24	0.25	1.85	0.07
Extraversion	0.07	0.10	1.23	0.22
Openness	0.01	0.10	0.12	0.90
Agreeableness	0.03	0.10	0.62	0.54
Conscientiousness	−0.03	0.11	−0.48	0.63
Dissociation	0.35	7.29	1.59	0.11
Neuroticism Dissociation	−0.32	0.24	−1.14	0.26
Step 2
Previous trauma	0.34	0.05	7.64	0.00*	0.158
Neuroticism	0.09	0.09	2.06	0.04*
Dissociation	0.11	1.54	2.28	0.02*

In the variable column: perceived war-zone stress (Danger–Injury Exposure Scale) was measured at homecoming. All other variables were measured at pre-deployment. Step 1 includes all predictor variables in the model. The final analysis provides the best-fit model in step 2, which includes the predictor variables that make a significant contribution.

β, standardized coefficient; SE, standard error.

*p < 0.05.