When a maritime disaster disrupts the community: The longitudinal course of Post-traumatic stress disorder and predicted factors after Sewol ferry disaster in South Korea

Background: The present study assessed acute, delayed, and chronic post-traumatic stress disorder (PTSD) in community residents affected by the disaster, as well as the factors related to the manifestation of symptoms. Methods: A total of 2,597 community residents who lived in Jindo, where the Sewol ferry disaster occurred, participated in a survey at baseline (1.5 months); 1,228 (47%) of these respondents were followed-up 15 months later. The variables included demographic characteristics, witnessing the rescue scene, being a community volunteer, and lifetime traumatic experiences. PTSD, depression, and anxiety symptoms were measured using the Impact of Events Scale-Revised (IES-R), Center for Epidemiologic Studies Depression (CESD), and Beck Anxiety Inventory (BAI), respectively. An assessment of property loss due to the Sewol ferry disaster was also included in the follow-up evaluation. Results: The proportion of PTSD cases among community residents at baseline and follow-up were 16.1% and 15.6% (delayed PTSD, 10.1; chronic PTSD, 5.5%), respectively. Depression and anxiety symptoms at each time point were consistently associated with acute, delayed, and chronic PTSD. Logistic regression analyses showed that anxiety symptoms at baseline predicted the delayed and chronic PTSD. Chronic PTSD was independently predicted by the witness rescue and loss of property immediately after the disaster. Conclusions: The present findings provide important evidence supporting the need for comprehensive assessment and management of mental health problems in community residents exposed to a disaster. Financial losses experienced by community residents after a trauma must also be addressed, and psychiatric comorbidities such as depression and anxiety should be identified and treated.