title: Relationship between current sleep duration and past suicidal ideation or attempt among Korean adolescents.
abstract: OBJECTIVE
  To comprehensively examine the relationship between current sleep duration and past suicidal idea or attempt among Korean adolescents.
  
  
  METHODS
  Data came from the 2009 Korea Youth Risk Behavior Web-based Survey with 75 066 participants (with the participation rate of 97.6%) in 800 middle and high schools. Binary logistic regression was conducted by gender and depressed mood to identify significant factors for suicidal ideation/attempt. The dependent variable was the log odds of suicidal ideation/attempt, while the independent/control variables were sleep duration and other demographic, socio-economic and health-related factors.
  
  
  RESULTS
  A negative association between sleep duration and suicidal ideation or attempt was weaker for those with depressed mood than for those without such experience in Korea for Year 2009. The odds ratio of suicidal ideation/attempt regarding less than 4 hours of sleep compared to 6 to 7 hours of sleep, was smaller in a group with depressed mood than in a group without such experience, for example, 1.64 (95% confidence interval [CI], 1.29 to 2.08) vs. 2.06 (95% CI, 1.34 to 3.17) for men's suicidal ideation, 2.50 (95% CI, 1.69 to 3.69) vs. 3.89 (95% CI, 1.74 to 8.66) for men's suicidal attempt. A negative association between age (or self-rated health) and suicidal ideation/attempt was also weaker for those with depressed mood than for those without such experience in the nation for the year.
  
  
  CONCLUSIONS
  There was a negative association between sleep duration and suicidal ideation/attempt in Korea for Year 2009 and this association was weaker for those with depressed mood than for those without such experience. Based on the findings of this study, adolescents' better mental health and longer, more comfortable sleep might help to prevent their suicidal ideation and attempt in Korea.
authors.affiliation: Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea. ; Health Services Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Sung-In
authors.initials: SI
authors.lastname: Jang
authors.affiliation: Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea. ; Health Services Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Kwang-Sig
authors.initials: KS
authors.lastname: Lee
authors.affiliation: Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea. ; Health Services Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Eun-Cheol
authors.initials: EC
authors.lastname: Park
mesh_terms: D000293:Adolescent; D003710:Demography; D005260:Female; D006801:Humans; D020407:Internet; D016015:Logistic Models; D008297:Male; D016017:Odds Ratio; D056910:Republic of Korea; D012737:Sex Factors; D012890:Sleep; D012959:Socioeconomic Factors; D059020:Suicidal Ideation; D013406:Suicide, Attempted / Q000706:statistics & numerical data; D013997:Time Factors; D014584:User-Computer Interface
keywords: Adolescent; Depressed mood; Korea; Sleep duration; Suicidal attempt; Suicidal ideation