INTRODUCTION Although the evidence base on bullying victimization and self-harm in young people has been growing, most studies were cross-sectional, relied on self-reported non-validated measures of self-harm, and did not separate effects of in-person and cyberbullying. This study aimed to assess associations of self-harm following in-person bullying at school and cyberbullying victimization controlling for covariates. METHODS School survey data from 11 to 16 years pupils collected in 2017 from 39 Welsh secondary schools were linked to routinely collected data. Inverse probability weighting was performed to circumvent selection bias. Survival analyses for recurrent events were conducted to evaluate relative risks (adjusted hazard ratios [AHR]) of self-harm among bullying groups within 2 years following survey completion. RESULTS A total of 35.0% (weighted N = 6813) of pupils reported being bullied, with 18.1%, 6.4% and 10.5% being victims of in-person bullying at school only, cyberbullying only and both in-person bullying at school and cyberbullying respectively. Adjusting for covariates, effect sizes for self-harm were significant after being in-person bullied at school only (AHR = 2.2 [1.1-4.3]) and being both in-person bullied at school and cyberbullied (AHR = 2.2 [1.0-4.7]) but not being cyberbullied only (AHR = 1.2 [0.4-3.3]). Feeling lonely during recent summer holidays was also a robust predictor (AHR = 2.2 [1.2-4.0]). CONCLUSIONS We reaffirm the role of in-person bullying victimization on self-harm. Pupils were twice as likely to self-harm following in-person bullying as their nonvictimised peers. Interventions for young people that minimize the potential impacts of bullying on self-harm should also include strategies to prevent loneliness.

中文翻译：

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中学适龄儿童的自我伤害、当面欺凌和网络欺凌：威尔士的一项数据关联研究。

引言 尽管关于青少年欺凌受害和自我伤害的证据基础一直在增长，但大多数研究都是横断面研究，依赖于自我报告的未经验证的自我伤害措施，并且没有将面对面和自我伤害的影响分开。网络欺凌。本研究旨在评估在学校面对面欺凌后自残与控制协变量的网络欺凌受害之间的关联。方法 将 2017 年从 39 所威尔士中学收集的 11 至 16 岁学生的学校调查数据与常规收集的数据相关联。进行逆概率加权以规避选择偏差。对复发事件进行生存分析，以评估调查完成后 2 年内欺凌群体自我伤害的相对风险（调整后的风险比 [AHR]）。结果 总共 35 个。0%（加权 N = 6813）的学生报告被欺负，其中 18.1%、6.4% 和 10.5% 分别是仅在学校面对面欺凌、仅在网络欺凌以及在学校面对面欺凌和网络欺凌的受害者。调整协变量后，自残的影响大小在仅在学校被当面欺凌 (AHR = 2.2 [1.1-4.3]) 并且在学校被当面欺凌和网络欺凌 (AHR = 2.2 [1.0-4.7] 后显着]) 但不仅仅是网络欺凌 (AHR = 1.2 [0.4-3.3])。在最近的暑假期间感到孤独也是一个强有力的预测因素 (AHR = 2.2 [1.2-4.0])。结论 我们重申当面欺凌受害对自残的作用。面对面欺凌后，学生自残的可能性是未受害同龄人的两倍。