The effect of mindfulness-based cognitive therapy on non-suicidal self-injury in hospitalized adolescents with depressive disorders: a randomized controlled trial.

BACKGROUND

Nonsuicidal self-injury (NSSI) in adolescents with depressive disorder is characterized by recurrent impulsivity and is a predictor of future suicidal behavior, necessitating effective and feasible interventions. Mindfulness-based cognitive therapy for adolescents (MBCT-A), a first-line treatment for depression, was evaluated in this trial for its efficacy in reducing NSSI in this population.

METHODS

In this randomized, single-blind, controlled trial, 94 hospitalized adolescents diagnosed with depressive disorder and engaging in NSSI were allocated to either MBCT-A plus treatment-as-usual (TAU) or TAU alone. The primary outcome was the severity of NSSI, measured by the Adolescent Self-Harm Scale (ASHS) at baseline, post treatment (4 weeks), and at 1-month follow-up. Secondary outcomes encompassed symptoms of anxiety, depression, emotion regulation, risk behaviors, life satisfaction, resilience, rumination, coping styles, and mindfulness. Both intention-to-treat (ITT) and per-protocol (PP) analyses were conducted.

RESULTS

Both ITT and PP analyses revealed significant between-group differences in NSSI severity at 4 weeks. Compared to the control group, the MBCT-A group showed significant improvements in mindfulness awareness, nonreactivity, emotional awareness, depressive symptoms, emotion regulation, and rumination (all P < 0.05). At the 1-month follow-up, the intervention group maintained a significant reduction in NSSI severity (interaction effect: F = 9.454, P < 0.001).

CONCLUSIONS

MBCT-A is effective in reducing NSSI behavior and improving mindfulness, emotion regulation, and depressive symptoms among adolescents with depressive disorder and NSSI. These findings support the clinical application of MBCT-A for this high-risk population.