J Korean Med Sci.  2023 May;38(17):e132. 10.3346/jkms.2023.38.e132.

Investigation of the Subtypes of Nonsuicidal Self-Injury Based on the Forms of Self-Harm Behavior: Examining Validity and Utility via Latent Class Analysis and Ecological Momentary Assessment

Affiliations
  • 1Department of Psychiatry, Hanyang University Medical Center, Seoul, Korea
  • 2Department of Psychology, Yeungnam University, Gyeongsan, Korea
  • 3Cultural Contents Technology Research Institute, Gachon University, Seongnam, Korea
  • 4Department of Counseling Psychology, Hanyang Cyber University, Seoul, Korea
  • 5Department of Psychology, Kangwon National University, Chuncheon, Korea

Abstract

Background
This study aimed to empirically derive and validate subtypes of nonsuicidal selfinjury (NSSI) based on the forms of self-harm behavior.
Methods
Sixty young adults who exhibited repetitive NSSI completed a clinical interview and baseline measures, followed by a two-week ecological momentary assessment (EMA). A latent class analysis was administered to identify NSSI subtypes based on the forms of self-harm behavior. The subtypes were then compared to baseline clinical and EMA variables, including emotions and urges to self-harm.
Results
The best-fitting model supported two subtypes: 1) substance abuse and suicide attempt subtype and 2) cutting and scratching subtype. The substance abuse and suicide attempt subtype reported a higher rate of engaging in lifetime suicide plans and suicide attempts and a higher number of lifetime suicide attempts. They also showed significantly higher severity of self-harm behavior, borderline personality traits, anger, posttraumatic symptoms, and difficulties in emotion regulation when compared to the cutting and scratching subtype. However, there was no inter-subtype difference in self-esteem. In the EMA data, anger toward others, feeling of rejection, loneliness, and helplessness were significantly high in the substance abuse and suicide attempt subtype. The variability of anger toward others was also higher in this subtype compared to the cutting and scratching subtype. Finally, in the two-week research period, the substance abuse and suicide attempt group showed a higher rate of reported urges to self-harm with or without suicidal intent.
Conclusion
Findings support the validity of the subtypes based on the forms of self-harm behavior, suggesting the clinical utility of addressing heterogeneity within individuals exhibiting self-harm for assessment and treatment.

Keyword

Nonsuicidal Self-Injury (NSSI); Self-Arm; Subtype; Latent Class Analysis (LCA); Ecological Momentary Assessment (EMA)

Figure

  • Fig. 1 Class-based probability of endorsing different forms of self-harm behavior.SHI = Self-Harm Inventory.


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