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Understanding these joint trajectories and their interpersonal predictors is critical for early identification and effective intervention. This longitudinal study examined how NSSI and depression co\u2010develop in Chinese college students and tested four interpersonal predictors (parent\u2010child, peer, teacher\u2010student, and dormitory relationships) via latent class growth analysis (LCGA). Three\u2010wave data over 12\u00a0months revealed two NSSI trajectories (Low\u2010Stable and High\u2010Decreasing) and three depression trajectories (Low\u2010Stable, Moderate\u2010Fluctuating, High\u2010Stable). Joint trajectories of NSSI and depression formed two patterns: Low\u2010Comorbidity\u2010Stable and Moderate\u2010Comorbidity \u2010Decreasing. Parent\u2010child, peer, and dormitory relationships each predicted lower\u2010risk trajectories, with dormitory ties exerting the strongest influence and suggesting that dormitory environments serve as crucial intervention targets. In contrast, teacher\u2010student relationships had no significant effect, a finding that warrants further investigation. Findings indicate that interpersonal stressors and the buffering effect of supportive relationships shape stress\u2010related health outcomes in emerging adults, with implications for interpersonal\u2010focused campus prevention strategies.<\/jats:p>","DOI":"10.1002\/smi.70170","type":"journal-article","created":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T11:18:10Z","timestamp":1774523890000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Heterogeneous and Joint Developmental Trajectories of Non\u2010Suicidal Self\u2010Injury and Depression in Emerging Adulthood: The Role of Interpersonal Dynamics"],"prefix":"10.1002","volume":"42","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-8525-2927","authenticated-orcid":false,"given":"Shuqian","family":"Liang","sequence":"first","affiliation":[{"name":"Department of Psychology School of Humanities and Social Sciences Beijing Forestry University  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiajing","family":"Li","sequence":"additional","affiliation":[{"name":"School of Biological Sciences Beijing Forestry University  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuyu","family":"Shan","sequence":"additional","affiliation":[{"name":"Department of Psychology School of Humanities and Social Sciences Beijing Forestry University  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Psychology School of Humanities and Social Sciences Beijing Forestry University  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiuya","family":"Lei","sequence":"additional","affiliation":[{"name":"Department of Psychology School of Humanities and Social Sciences Beijing Forestry University  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2026,3,26]]},"reference":[{"key":"e_1_2_13_2_1","doi-asserted-by":"publisher","DOI":"10.1037\/0003\u2010066X.55.5.469"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1037\/abn0000362"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10802\u2010014\u20109895\u20104"},{"key":"e_1_2_13_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/9781118619179"},{"key":"e_1_2_13_6_1","volume-title":"Attachment and Loss: Vol. 1 Attachment","author":"Bowlby J.","year":"1969"},{"key":"e_1_2_13_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10802\u2010005\u20106739\u20102"},{"key":"e_1_2_13_8_1","doi-asserted-by":"publisher","DOI":"10.4159\/9780674028845"},{"key":"e_1_2_13_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psychres.2018.01.045"},{"key":"e_1_2_13_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psychres.2020.112934"},{"key":"e_1_2_13_11_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0954579400005319"},{"key":"e_1_2_13_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.brat.2005.03.005"},{"key":"e_1_2_13_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jad.2025.119941"},{"key":"e_1_2_13_14_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev\u2010psych\u2010122414\u2010033259"},{"key":"e_1_2_13_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10826\u2010015\u20100138\u20102"},{"key":"e_1_2_13_16_1","doi-asserted-by":"publisher","DOI":"10.1037\/0022\u2010006X.76.2.173"},{"key":"e_1_2_13_17_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10578\u2010016\u20100682\u2010z"},{"key":"e_1_2_13_18_1","doi-asserted-by":"publisher","DOI":"10.1207\/S15328007SEM0803_5"},{"key":"e_1_2_13_19_1","doi-asserted-by":"publisher","DOI":"10.1080\/02673843.2025.2507116"},{"key":"e_1_2_13_20_1","volume-title":"The Relationship Between Adolescent self\u2010harm Behaviors and Individual Emotional Factors and Family Environmental Factors","author":"Feng Y.","year":"2008"},{"key":"e_1_2_13_21_1","doi-asserted-by":"publisher","DOI":"10.1177\/0165025409342634"},{"key":"e_1_2_13_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.comppsych.2017.10.007"},{"key":"e_1_2_13_23_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598\u2010020\u201072998\u20101"},{"key":"e_1_2_13_24_1","doi-asserted-by":"publisher","DOI":"10.3389\/fpsyt.2023.1279108"},{"key":"e_1_2_13_25_1","first-page":"444","volume-title":"Handbook of Depression","author":"Gotlib I. 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