title: Sleep duration among children 8 months after the 2011 Japan earthquake and tsunami.
abstract: BACKGROUND
  To elucidate relationships between disaster damage conditions and sleep duration among children who survived the 2011 Japan earthquake and tsunami.
  
  
  METHODS
  The subjects comprised 12,524 children in kindergartens, elementary schools, and junior high schools in Ishinomaki City, Miyagi Prefecture, Japan. The Post Traumatic Stress Symptoms for Children 15 items (PTSSC-15), a self-completion questionnaire on traumatic symptoms, and a sleep questionnaire were distributed to them. A questionnaire regarding disaster damage conditions of the children's homes was distributed to their teachers. Of 12,524, an effective response was obtained from 11,692 (93.3%).
  
  
  RESULTS
  Relationships between sleep duration and traumatic symptoms were displayed low correlations. Children with house damage and/or evacuation experiences slept for a significantly shorter time than children without these experiences.
  
  
  CONCLUSIONS
  It is critical not only to examine traumatic symptoms in children but also to collect sleep duration and disaster damage conditions following natural disasters.
authors.affiliation: National Center for Global Health and Medicine, Kohnodai Hospital, Department of Child and Adolescent Psychiatry, Ichikawa, Japan. usami.masahide@gmail.com
authors.forename: Masahide
authors.initials: M
authors.lastname: Usami
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Iwadare
authors.forename: Masaki
authors.initials: M
authors.lastname: Kodaira
authors.forename: Kyota
authors.initials: K
authors.lastname: Watanabe
authors.forename: Momoko
authors.initials: M
authors.lastname: Aoki
authors.forename: Chiaki
authors.initials: C
authors.lastname: Katsumi
authors.forename: Kumi
authors.initials: K
authors.lastname: Matsuda
authors.forename: Kazunori
authors.initials: K
authors.lastname: Makino
authors.forename: Sonoko
authors.initials: S
authors.lastname: Iijima
authors.forename: Maiko
authors.initials: M
authors.lastname: Harada
authors.forename: Hiromi
authors.initials: H
authors.lastname: Tanaka
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tanaka
authors.forename: Hirokage
authors.initials: H
authors.lastname: Ushijima
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Saito
mesh_terms: D002648:Child; D055866:Earthquakes; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D018570:Risk Assessment; D012890:Sleep; D013313:Stress Disorders, Post-Traumatic / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology; D011795:Surveys and Questionnaires; D013997:Time Factors; D057192:Tsunamis