Abstract
Objectives
The Transdiagnostic Self-injury Interview (TSI) is a new measure that assesses the onset, frequency, methods, and severity of non-suicidal self-injury. The aims were to demonstrate the feasibility of a TSI validation study, and to investigate TSI’s criterion validity, clinical correlates, and interrater reliability.
Materials and methods
Recruiting sites were psychiatric in- and outpatient units. Feasibility targets included number of participants completing the study, TSI completion time, total participation time, participants experiencing exacerbation of symptoms, along with other targets. Criterion validity was evaluated using the Deliberate Self-Harm Inventory (DSHI). Clinical correlates were examined with the Columbia-Suicide Severity Rating Scale (C-SSRS), the Personal and Social Performance Scale, the Affective Lability Scale-18, and the Brief Trauma Questionnaire. Interrater reliability was evaluated with video recordings and written material.
Results
Fifty participants were included. The majority were women (76%) and had a mean age of 31.3 years (SD: 10.4). Schizophrenia (44%) and schizoaffective disorder (18%) were the most prevalent diagnoses. TSI took an average 9.3 min to complete and the total participation time was on average less than one hour. One participant experienced an exacerbation of self-injury ideation (without the need of intervention). A significant correlation was found between TSI and DSHI (r: 0.94, p-value: < 0.001). TSI was correlated to C-SSRS ideation intensity and ideation frequency but not suicidal attempts. TSI was not significantly correlated to other measures. Interrater reliabilities were statistically significant.
Conclusions
The results support the feasibility of a TSI validation study, which is needed to validate TSI in different settings and across diagnoses.
Acknowledgements
We would like to thank David Dines Jørgensen, Yun Glerup, and Mille Kjær for rating videos with TSI, and Maria Breil for back-translating DSHI.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Data availability statement
The data of this study are available from the corresponding author (JNK) upon reasonable request.
Additional information
Funding
Notes on contributors
Jesper Nørgaard Kjær
JNK is MD, Psychiatrist at Aarhus University Hospital - Psychiatry, Department of Psychosis.
Tine Holm
TH is Cand. Psych., PhD, at Aarhus University Hospital - Psychiatry, Department of Psychosis.
Trine Ellegaard
TE is Clinical Nurse Specialist, PhD, at Aarhus University Hospital - Psychiatry, Department of Psychosis.
Sissel Madsen
SM is Project Nurse at Aarhus University Hospital - Psychiatry, Department of Psychosis.
Eva Lorentzen
EL is Medical Student at at Aarhus University.
Ane Bjerg Christensen
ABC is MD at Aarhus University Hospital - Psychiatry, Department of Psychosis.
Vibeke Bliksted
VB is Cand. Psych., PhD, and Associate Professor at Aarhus University Hospital - Psychiatry, Department of Psychosis.
Ole Mors
OM is MD, Consultant Psychiatrist, and Professor, Department Chair at Aarhus University Hospital - Psychiatry, Department of Psychosis.
Signe Dolmer
SD is MD, Consultant Psychiatrist at Aarhus University Hospital - Psychiatry, Department of Psychosis