Patients with randomized admissions to 5 hospitals across Australia ( N = 596 ) were assessed in hospital and reassessed for PTSD at 3 ( n = 508 ) , 12 ( n = 426 ) , 24 ( n = 439 ) , and 72 ( n = 314 ) months using the Clinician-Administered PTSD Scale ; DSM-IV definition of PTSD was used at each assessment , and DSM-5 definition was used at 72 months .