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has been cited by the following article:

• TITLE: Epidemiological Studies on the Relationship between PTSD Symptoms and Circadian Typology and Mental/Sleep Health of Young People Who Suffered a Natural Disaster, Great Hanshin-Awaji Earthquake

  AUTHORS: Kai Wada, Hiroko Kuroda, Miyo Nakade, Hitomi Takeuchi, Tetsuo Harada

  KEYWORDS: Natural Disasters; Victims; PTSD; Sleep Quality; Circadian Typology

  JOURNAL NAME: Natural Science, Vol.6 No.5, March 13, 2014

  ABSTRACT: This study aims, first, to determine the relationship between Post Traumatic Stress Disorder (PTSD) and current circadian typology and sleep habits of adults who experienced the Great Hanshin-Awaji Earthquake in their childhood in January 1995. An integrated questionnaire was administered to 275 university students (females: 173, males: 93, unknown: 9) aged 19 - 37 (mean age: 21.9 years) in Hyogo Prefecture, Japan. The questionnaire consisted of basic questions about attributes, questions on sleep habits and sleep quality (Monroe’s sleep quality index), the Torsvall-?kerstedt Diurnal Type Scale and the Impact of Event Scale-Revised (IES-R) to obtain PTSD scores. Participants who scored 25 or more in the IES-R were placed in a high-traumatic group (HTG) and those who scored less than 25 were placed in a low-traumatic group (LTG). HTG participants exhibited significantly worse sleep quality than LTG participants (p 0.05), HTG participants woke more frequently during sleep (p