psychological investigation by Ehlers and Clark in 2000 suggested that negative posttraumatic appraisal is associated with the development and maintenance of posttraumatic Stress Disorder (PTSD). In their cognitive model of PTSD, they propose that prior trauma predicts negative posttraumatic appraisal. Meta-analyses have shown that prior trauma is also one of the predictors of PTSD. Negative posttraumatic appraisal might then mediate the relationship between prior trauma and PTSD, but this hypothesis has yet to be examined. The aim of this study was to examine whether prior trauma predicts negative posttraumatic appraisal, through a secondary analysis of the Tachikawa Cohort of Motor Vehicle Accident Study data.