Personality assessment with the Shedler-Westen assessment procedure 200 in a forensic sample: criterion validity and contribution to structured forensic clinical judgement

Abstract

Current investigation focused on the criterion validity in a forensic sample of the Dutch language version of the Shedler-Westen Assessment Procedure (SWAP-200-NL), a personality assessment instrument completed by the examiner. We inquired into two areas: a) possible differences between a forensic and general mental health care population for SWAP-200-NL Personality Syndromes (PS) and Trait Dimensions (TD;N = 68), and b) explore criterion validity of SWAP-200-NL PS and TD scales for data from criminal records (N = 114). An ANOVA showed significantly higher scores for the forensic group on antisocial-psychopathic PS and psychopathy TD and lower scores on dysphoric, obsessional, high functioning depressive and avoidant PS than those for the general population. Furthermore, antisocial-psychopathic PS and psychopathy TD correlate negative with the age of first sentenced offence and positive with the number of sentenced offences in the past. Also, for the number of sentenced offences in probationary period we found significant mean differences for antisocial-psychopathic PS, and psychopathy and narcissistic TD. In contrast, criminal data showed inverse associations with scales representing obsessional, avoidant and depressive tendencies. In conclusion, present results support the differential diagnostic potential of the SWAP-200-NL and its clinical utility in forensic settings.