The role of peri-traumatic stress and disruption distress in predicting post-traumatic stress disorder symptoms following exposure to a natural disaster

Background Few studies have examined the contribution of specific disaster-related experiences to post-traumatic stress disorder (PTSD) symptoms. Aims To examine the roles of peri-traumatic stress and distress due to lingering disaster-related disruption in explaining linkages between disaster exposure and PTSD symptoms among a cohort exposed to the 2010-2011 Canterbury (New Zealand) earthquakes. Method Structural equation models were fitted to data obtained from the Christchurch Health and Development Study at age 35 (n= 495), 20-24 months following the onset of the disaster. Measures included: earthquake exposure, peri-traumatic stress, disruption distress and PTSD symptoms. Results The associations between earthquake exposure and PTSD symptoms were explained largely by the experience of peritraumatic stress during the earthquakes (beta= 0.189, P< 0.0001) and disruption distress following the earthquakes (beta= 0.105, P<0.0001). Conclusions The results suggest the importance of minimising post-event disruption distress following exposure to a natural disaster.