Offenders With Personality Disorder Who Fail to Progress: A Case-Control Study Using Partial Least Squares Structural Equation Modeling Path Analysis.

Background: Offenders with personality disorder can be challenging to engage and retain in treatment. The UK Offender Personality Disorder (OPD) pathway aims to proactively and responsively identify and engage offenders with personality disorder. However, a subpopulation of offenders on the pathway have been found to not be accepted into any OPD service and therefore fail to progress.

Objective: This study aims to identify and describe offenders on the OPD pathway who fail to progress and to understand the causal drivers by which individuals fail to progress in the pathway.

Methods: A sample of 50 offenders on the OPD pathway who had been refused from at least two OPD services (nonprogression group) were compared to 100 offenders accepted into OPD services (control group). Partial least squares structural equation modeling was used to model the causal factors involved in not being accepted into OPD services.

Results: The path coefficients in the structural model showed that the most influential factor in nonprogression was attitude toward treatment (β=.41; P<.001; f=0.25) alongside those with psychopathology (β=.41; P<.001; f=0.25), specifically, psychopathy, psychosis, and co-occurring personality disorder.

Conclusions: The findings of the study provide a basis of how to work with this population in the future to increase the likelihood of acceptance into OPD services.