Vol. 74, No. 1 (Winter 2010) 1 This work was supported by research grants from the Government of Quebec (FQRSC 77193) and the Government of Canada (CRSH 752-2001-1562) to Sébastien Laro- chelle. Correspondence regarding this article should be addressed to Sébastien Laro- chelle, Département de Psychoéducation et de Psychologie, Université du Québec en Outaouais, 283 boul. Alexandre-Taché, Case postale 1250, succursale Hull, Gatineau, Québec, Canada, J8X 3X7; e-mail: sebastien.larochelle@uqo.ca. We thank Frank E. Yeomans for comments on earlier versions of this article. (Copyright © 2010 The Menninger Foundation) PNC AMONG SEXUAL OFFENDERS Larochelle et al. Psychological dimensions of antisocial personality disorder as predictors of psychotherapy noncompletion among sexual offenders Sébastien Larochelle, PhD Louis Diguer, PhD Olivier Laverdière, PhD Dominick Gamache, MPs Paul Samuel Greenman, PhD Jean Descôteaux, PhD The goal of this study was to examine whether psychological dimen- sions of antisocial personality disorder (ASPD), as conceptualized by Kernberg (1992), could predict psychotherapy noncompletion (PNC) among 50 men found guilty of sexual abuse of children. All participants began a 65-week, court-mandated course of cognitive- behavioral psychotherapy, which 20 (40%) of them did not com- plete. Pretherapy personality was assessed with the Structured Clinical Interview for DSM Axis II Disorders (First, Spitzer, Gibbon, Williams, & Benjamin, 1997), the Personality Organization Dia- gnostic Form (Diguer, Normandin, & Hébert, 2001), and Blatt and colleagues’ (Blatt, Bers, & Schaffer, 1993; Blatt, Chevron, Quinlan, Schaffer, & Wein, 1988) scales of mental representations, as well as the State-Trait Anger Expression Inventory (Spielberger, 1988). A discriminant function analysis, which explained 46% of the total variance, showed that descriptive (antisocial and narcissistic persona- lity disorders), psychological (primitive defense mechanisms, identity diffusion and self-representations), and demographic (work status