Inter-Rater and Test-Retest Reliability, Internal Consistency, and Factorial Structure of the Instrument for Forensic Treatment Evaluation

Abstract

In this study, the Instrument for Forensic Treatment Evaluation (IFTE) is introduced. The IFTE includes 14 dynamic items of the risk assessment scheme HKT-R and eight items specifically related to the treatment of forensic psychiatric patients. The items are divided over three factors: protective behavior, problematic behavior and resocialization skills. Inter-rater reliability and test-retest reliability ranged from moderate to almost perfect in a Dutch population of 232 forensic patients. Factor analysis largely confirmed the factor structure. The IFTE is evaluated to be a reliable routine outcome monitoring instrument for supporting and indicating inpatient forensic psychiatric treatment evaluations and processes.