Associations between time in bed and suicidal thoughts, plans and attempts in Korean adolescents.
OBJECTIVE
To examine the hypothesis that respondents with any of three specific sleep patterns would have a higher likelihood of suicidality than those without reports of these patterns in Korean adolescents.


METHODS
Data from the 2011-2013 Korea Youth Risk Behavior Web-based Survey were used.


METHODS
191,642 subjects were included. The survey's target population was students in grades 7 through 12 in South Korea.


METHODS
Sleep time.


METHODS
Suicidal thoughts, plans and attempts.


RESULTS
The odds of suicidal thoughts in subjects with very short or long time in bed were 1.487-fold higher (95% CI 1.219 to 1.815) or 0.611-fold lower (95% CI 0.460 to 0.811), respectively, than for subjects with 7 h/day in bed; the odds were similar for suicidal plans. The odds of suicidal thoughts in subjects with early or late awakening times were 1.231-fold higher (95% CI 1.050 to 1.442) or 1.528-fold lower (95% CI 1.000 to 2.334), respectively, than for subjects with 7 h/day in bed; these odds were lower for suicidal plans and attempts. The odds of suicidal thoughts in subjects with early bedtime were 1.748-fold higher (95% CI 1.302 to 2.346), the odds of suicidal plans in people with an early bedtime were 2.494-fold higher (95% CI 1.671 to 3.722) and the odds of suicide attempts in subjects with late bedtime were 1.313-fold higher (95% CI 1.005 to 1.716) than for subjects with a bedtime of 23:00.


CONCLUSIONS
The sleep-related time is associated with suicide-related behaviours in Korean adolescents. Multilateral approaches are needed to identify the greatest risk factors for suicidal behaviours.
Department of Public Health, Graduate School, Yonsei University, Seoul, Korea Institute of Health Services Research, Yonsei University College of Medicine, Seoul, Korea.
Jae-Hyun
JH
Kim
Institute of Health Services Research, Yonsei University College of Medicine, Seoul, Korea Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.
Eun-Cheol
EC
Park
Institute of Health Services Research, Yonsei University College of Medicine, Seoul, Korea Department of Hospital Management, Graduate School of Public Health, Yonsei University, Seoul, Korea.
Sang Gyu
SG
Lee
Department of Healthcare Management, Eulji University, Sungnam, Korea.
Ki-Bong
http://orcid.org/0000-0001-7073-8586
KB
Yoo
D000293:Adolescent; D000294:Adolescent Behavior; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D056910:Republic of Korea; D012307:Risk Factors; D012737:Sex Factors; D012890:Sleep; D012893:Sleep Wake Disorders / Q000150:complications / Q000523:psychology*; D059020:Suicidal Ideation; D013406:Suicide, Attempted; D013995:Time
EPIDEMIOLOGY; MENTAL HEALTH