DOI: 10.3886/e237623v1
title: Joint Developmental Pathways of NSSI and Depressive Symptoms in Emerging Adults (Three-Wave Panel, 2021–2022)

description: This dataset derives from a three-wave longitudinal study designed to map the joint developmental trajectories of non-suicidal self-injury (NSSI) and depressive symptoms in emerging adults, and to examine interpersonal predictors of trajectory membership. Data were collected from university students at three six-month intervals (T1 = 1 October 2021; T2 = 1 April 2022; T3 = 1 October 2022). The original sample comprised 520 respondents; after data-quality screening (including validity items) the analytic sample includes 512 complete cases. Key variables include: self-reported NSSI behaviors (frequency/severity), depressive symptom scores (10-item CES-D), measures of four interpersonal domains (parent-child, peer, teacher-student, and dormitory relationships), and standard demographics.
description: 本研究未采用任何加权程序。
description: Response Rates: In the first wave of data collection (T1, October 2021), a total of 520 undergraduates were invited to participate in the classroom survey, and 512 valid questionnaires were obtained, yielding a response rate of 98.5%. In the second wave of data collection (T2, April 2022), 498 of the original participants completed the follow-up survey, with a retention rate of 97.3%. In the third wave of data collection (T3, October 2022), 428 participants remained in the study, corresponding to an overall retention rate of 83.6% compared to T1.
description: Presence of Common Scales: The 18-item <b>Deliberate Self-Harm Inventory (DSHI)</b> assessed NSSI frequency over the past six months. Participants reported the type (e.g., cutting, burning) and frequency of each behavior. Total scores were calculated by summing the product of severity (rated 1-4) and frequency for each act.<br>The 10-item <b>Center for Epidemiologic Studies Depression Scale (CES-D) </b>measured depressive symptom frequency over the past week (0 =“rarely” to 3 = “most of the time”) . <br>The 30-item <b>Relationship Quality Version (RQV)</b> evaluated two dimensions: Closeness (e.g., “I feel loved by my parents”) and Conflict (e.g., “We argue about small things”), rated on a 5-point scale (1 = “never” to 5 = “always”) .<br>A 20-item <b>Peer Relationship Satisfaction Scale</b> assessed three dimensions: social-emotional support, interpersonal harmony, and interaction frequency.<br>The 18-item <b>Perceived Teacher Emotional Support Questionnaire</b> measured four domains: understanding, care, encouragement, and respect. <br>A 17-item <b>University Dormitory Relationship Scale</b> evaluated overall dormitory dynamics.
description: 本研究采用便利抽样方法，选取北京市高校在校本科生作为青年期样本。
description: Undergraduate students enrolled at universities aged 18–25.. Smallest Geographic Unit: Universities in Beijing, China
description: on-site questionnaire; The data were collected in three waves at six-month intervals: October 1, 2021 (T1), April 1, 2022 (T2), and October 1, 2022 (T3). Participants completed self-administered questionnaires in classroom settings under the supervision of trained research assistants. All measures were standardized instruments with established reliability and validity in Chinese populations. Data entry and cleaning were performed using SPSS 26.0, and missing values were handled with full information maximum likelihood (FIML) in Mplus 8.0.