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This study examined how childhood trauma profiles are associated with addictive features of NSSI, focusing on rumination as mediator and age at onset as moderator. A latent class analysis of 1506 adolescents identified four trauma profiles: low trauma, high neglect trauma, high emotional trauma, and complex trauma. Adolescents in the high emotional and complex trauma groups showed higher addictive features of NSSI. Rumination partially mediated this relationship. Age of onset moderated the association between complex trauma and addictive features of NSSI, with earlier onset linked to stronger addictive tendencies. Johnson\u2013Neyman analysis showed this association was significant when onset age was approximately 15.81\u2009years or younger. 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