INTRODUCTION The "Cutting Down Programme" (CDP), a brief psychotherapeutic intervention for treating nonsuicidal self-injury (NSSI) in adolescents, was comparable to high-quality treatment as usual (TAU) in a previous randomized controlled trial (RCT). OBJECTIVE The aim of the study was to evaluate the long-term outcomes of the CDP over up to 4 years. METHODS Assessments of NSSI, suicide attempts, borderline personality disorder (BPD), depression, and quality of life took place 2 to 4 years (T3) after enrollment in a RCT. The evolution of NSSI, suicide attempts, depression, and quality of life was analyzed using (generalized) linear mixed-effects models. Ordered logistic regression was used for analyzing BPD diagnoses. Data from T0, T2, and T3 are reported. RESULTS Out of 74 patients, 70 (95%) were included in the T3 assessment. The frequency of NSSI events alongside with suicide attempts and depression further decreased between T2 and T3 and BPD between T0 and T3 in both groups. Quality of life remained stable in both groups between T2 and T3. Both groups received substantial but comparable additional treatment between T2 and T3. More treatment sessions during the follow-up period were linked to larger improvements of NSSI. CONCLUSIONS The CDP was found to be as effective as TAU in promoting recovery from NSSI and comorbid symptoms in the long term. Results suggest that treatment effects from a brief psychotherapeutic intervention may endure and even further improve after completion of the program. However, additional treatment seems to improve chances for recovery independent from CDP versus TAU.

中文翻译：

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对非自杀性自残青少年的简短心理治疗干预与常规治疗的比较：2-4 年随访结果。

简介 “削减计划”(CDP) 是一种治疗青少年非自杀性自伤 (NSSI) 的简短心理治疗干预措施，与之前的随机对照试验 (RCT) 中的高质量治疗 (TAU) 相当。目的 该研究的目的是评估 CDP 长达 4 年的长期成果。方法 NSSI、自杀未遂、边缘性人格障碍 (BPD)、抑郁症和生活质量的评估在随机对照试验入组后 2 至 4 年 (T3) 进行。使用（广义）线性混合效应模型分析了 NSSI、自杀未遂、抑郁和生活质量的演变。使用有序逻辑回归分析 BPD 诊断。报告 T0、T2 和 T3 的数据。结果 74 名患者中，70 名 (95%) 被纳入 T3 评估。两组中 T2 和 T3 之间的 NSSI 事件以及自杀未遂和抑郁的频率进一步下降，而 T0 和 T3 之间的 BPD 频率进一步下降。T2 和 T3 期间两组的生活质量保持稳定。两组在 T2 和 T3 之间都接受了大量但相当的额外治疗。随访期间更多的治疗疗程与 NSSI 的更大改善有关。结论 从长远来看，CDP 在促进 NSSI 和合并症症状恢复方面与 TAU 一样有效。结果表明，短暂的心理治疗干预的治疗效果可能会持续，甚至在项目完成后进一步改善。然而，与 TAU 相比，额外的治疗似乎可以提高独立于 CDP 的康复机会。