Xu Han, Lai Lianting, Guo Jiale, Wang Jian
Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China.
Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
BMJ Open. 2025 Aug 21;15(8):e098873. doi: 10.1136/bmjopen-2025-098873.
Non-suicidal self-injurious behaviour (NSSI) is defined as purposeful self-injury without the intention to die. NSSI has become an important threat to public health among teenagers globally, imposing considerable costs on individuals, families and society. It reflects poor emotional regulation and serves as an early warning sign for suicidal ideation and behaviour. The purpose of this study is to look at the prevalence of NSSI and the risk factors related to it in Beijing's adolescent population.
Epidemiological surveys and qualitative interviews will both be used in this study. First, a cross-sectional epidemiological survey with stratified sampling will assess the prevalence, risk factors and variables associated with NSSI among adolescents in Beijing. The survey will include a sample size of at least 1415 adolescents. The significance of emotional control, social support and mental health in NSSI conduct will then be investigated through qualitative interviews. This part of the study will use a phenomenological qualitative research approach, with the sample size determined by data saturation, typically around 10 participants, but flexible due to the large sample from the epidemiological survey. In order to investigate the prevalence of NSSI, statistical analysis of correlation, descriptive statistics and regression analysis with multiple variables will be used to analyse the survey data using SPSS V.27.0 and Excel 2003. NVivo V.12 software will be used to code the qualitative data, and thematic analysis and word frequency will be used to find connections between the various NSSI experiences.
The Guang'anmen Hospital Ethics Committee of the China Academy of Chinese Medical Sciences has given its approval to the project (no. 2023-259-KY). Participants will provide both verbal and written informed consent prior to participation, with legal guardians signing for the qualitative part of the study. Participants will be informed of their right to withdraw from the study at any time without affecting their clinical care. Results will be shared through academic journals, conferences and public health platforms to raise awareness of NSSI and inform related policy development.
ChiCTR2400085968.
非自杀性自伤行为（NSSI）被定义为有目的的自我伤害且无死亡意图。NSSI已成为全球青少年公共卫生的一个重要威胁，给个人、家庭和社会带来了相当大的代价。它反映了情绪调节不良，并作为自杀意念和行为的早期预警信号。本研究的目的是了解北京青少年人群中NSSI的患病率及其相关风险因素。
本研究将采用流行病学调查和定性访谈。首先，一项采用分层抽样的横断面流行病学调查将评估北京青少年中与NSSI相关的患病率、风险因素和变量。该调查将包括至少1415名青少年的样本量。然后将通过定性访谈研究情绪控制、社会支持和心理健康在NSSI行为中的重要性。本研究的这一部分将采用现象学定性研究方法，样本量由数据饱和确定，通常约为10名参与者，但由于流行病学调查的样本量较大，样本量具有灵活性。为了调查NSSI的患病率，将使用相关性统计分析、描述性统计和多变量回归分析，使用SPSS V.27.0和Excel 2003对调查数据进行分析。NVivo V.12软件将用于对定性数据进行编码，并使用主题分析和词频分析来找出各种NSSI经历之间的联系。
中国中医科学院广安门医院伦理委员会已批准该项目（编号：2023 - 259 - KY）。参与者在参与之前将提供口头和书面知情同意书，定性研究部分由法定监护人签字。参与者将被告知他们有权在任何时候退出研究而不影响其临床护理。研究结果将通过学术期刊、会议和公共卫生平台分享，以提高对NSSI的认识并为相关政策制定提供信息。
ChiCTR2400085968。
