Fourth, we tested six predispositions, representing two key classes: pre-existing disorders and parental history of psychopathology. Prior research has supported the role of these antecedent factors in PTSD (Brewin et al. 2000) and the results of this study confirm that observation. Other predispositions for PTSD have been identified, including specific genes (Binder et al. 2008; Koenen et al. 2009; Cornelis et al. 2010), intelligence (Macklin et al. 1998; Breslau et al. 2006; Gilbertson et al. 2006; Kremen et al. 2007) and neuroticism (Casella & Motta, 1990; Hyer et al. 1994; Engelhard et al. 2003; Parslow et al. 2006). Research on these predispositions in relation to the putative inverse relationship of predispositions according to trauma severity would be informative.
