Assessing socially desirable responding and its impact on self-report measures among sexual offenders

Abstract

It is often assumed that offenders employ socially desirable responding when completing self-report questionnaires, thereby invalidating such measures. The aim of this study is to examine the extent that sexual offenders employ socially desirable responding and the impact that socially desirable responding, as measured by the Balanced Inventory of Desirable Responding-6 (BIDR: 6, Paulhus, Journal of Personality and Social Psychology, 46, 598–609, 1984), has on self-report measures. The sample comprised 1730 adult males, all convicted and serving a sentence for a sexual offence. The entire sample had completed a set of self-report measures used to identify treatment needs, and examine progress in treatment. The results indicate that the extent of socially desirable responding is smaller than assumed, and its impact on a number of self-report measures is lower than expected. Furthermore, lower levels of risk of sexual re-offending were significantly associated with higher scores on the impression management subscale. We suggest that impression management should be viewed as more of a trait-like tendency rather than a validity check, and the use of this scale in determining whether or not to interpret other self-report instruments should be questioned. The present study also indicates that self-report questionnaires used with forensic populations may be accurate and valid. Implications for research and practice are discussed.

Keywords:

• sexual offenders
• socially desirable responding
• psychometric assessment