Data on prior trauma as a risk factor came from 23 studies (n = 5308), prior psychological adjustment, from 23 studies (n = 6797) and family history of psychopathology, from nine studies (n = 667). Ozer et al. (2003) found no evidence that these predispositions were less important in the etiology of PTSD among victims of interpersonal violence than victims of accidents. To the extent that differences in effect size were detected, they were in the reverse direction. Effect size associated with prior trauma was 0.27 for interpersonal violence and 0.12 for accidents (p = 0.05). Effect size associated with prior psychological adjustment was 0.31 for interpersonal violence and 0.28 for accidents (not significant). Effect size associated with psychopathology in family of origin was 0.31 for interpersonal violence and 0.08 for accidents (p = 0.01).
