Psychometric validation of the Brief Symptom Inventory 25 Forensic (BSI-25-F)

ABSTRACTThe Brief Symptom Inventory 25 Forensic (BSI-25-F) is a screening instrument for measuring the psychophysical distress of prisoners and forensic patients. The aim of the study was to validate the instrument. For this purpose, 165 forensic patients, 312 general psychiatric patients, and 1359 people from the general population completed the BSI-25-F. In addition, the data of the long-term prisoners who were studied when the instrument was originally developed were used for comparison. The item analyses revealed acceptable to very good item characteristics within the target samples of the prisoners and the forensic patients for the majority of the items. Reliability tests also showed acceptable to good values for the target samples. The differential validity but not the factorial validity could be proved. To conclude, the new BSI-25-F represents an economic, practicable, and reliable screening instrument for identifying prisoners who are in a need of treatment.