Clinical correlates of new-onset and persistent suicidal ideation in adolescents with major depressive disorder.

Background: Suicidal ideation (SI) is common in adolescents with major depressive disorder (MDD). SI not only poses a serious threat to the patient's life safety, but also significantly hinders the process of psychological recovery and the restoration of social functioning. However, there is still a relative lack of longitudinal studies on the factors influencing SI in adolescents with MDD. Therefore, this study aimed to explore the longitudinal trajectory of SI in adolescents with MDD and to identify the relevant influencing factors. Methods: This study included 122 adolescents with MDD. At baseline and one-year follow-up, patients were assessed for SI. Based on the assessment results, patients were divided into SI group and non-SI group. In addition, the standardized questions and the Center for Epidemiological Studies Depression scale (CES-D), the Childhood Trauma Questionnaire (CTQ), and the Toronto Alexithymia Scale (TAS-20) were used to evaluate non-suicidal self-injury (NSSI), depressive symptoms, childhood maltreatment (CM), and alexithymia. Logistic stepwise regression analyses were employed to identify factors independently associated with SI in adolescents with MDD. Results: In adolescents with MDD, the prevalence of SI was 68.0%. At the follow-up period, the prevalence of persistent suicidal ideation (PSI) was 19.7%, and the prevalence of new-onset SI was 20.5%. Regression analyses showed that single-child family ( Conclusion: Adolescents with MDD have a high risk of PSI, and new-onset SI should not be ignored. Factors such as single-child family, alexithymia, NSSI, and reduction of positive affect significantly affect the occurrence and persistence of SI. Therefore, early intervention targeting these factors is important to reduce the risk of adolescent suicide and improve mental health outcomes.