• Kwang Yul Jung, Taerim Kim, Sung Yeon Hwang, Tae Rim Lee, Hee Yoon, Tae Gun Shin, Min Seob Sim, Won Chul Cha, and Hong Jin Jeon.
• Department of Emergency Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
• J. Korean Med. Sci. 2018 Jul 23; 33 (30): e191.

BackgroundSuicide in young people is one of most common cause of death; and deliberate self-harm (DSH) is important indicator of suicide. It is currently unclear how old the rate begins to increase or when it reaches to the same level with adults. The purpose of this study was to find beginning age of DSH and compare their characteristics with adults.MethodsThis study retrospectively reviewed 5 years of nationwide prospective registry named Emergency Department-based Injury In-depth Surveillance (EDIIS) registry composed of all injured patients who were admitted to twenty tertiary university hospital emergency departments. Injured patients aged 29 years or younger from January 1, 2011 to December 31, 2015 were included. Incidence rate of DSH in all age was described. Patients were stratified by age: early teenage (11-15 years), late teenage (16-19 years), and early adulthood (20-29 years). Data of early teenage group were compared to those of other groups for examining their characteristics.ResultsAmong 588,549 injury patients, 8,400 patients reported DSH. The rate began to rise at age 11 and reach at age 16 which was equivalent to that of age 20 to 29. Early teenage had significantly higher excess mortality ratio based injury severity score (EMR-ISS) and had almost same level without significant difference in operation incidence or mortality compared to late teenage and early adulthood.ConclusionDSH rate began to rise at age 11, reaching adulthood level at age 16 in Korea.

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