Convergent and Discriminant Validity of Self-Report and Performance-Based Assessment of Object Relations

This study evaluated the Social Cognition and Object Relations Global Rating Method (SCORS-G; Stein, Hilsenroth, Mulford, & Pinkser, 2011; Stein and Mulford, 2018; Westen, 1995) and the Bell Object Relation and Reality Testing Inventory (BORRTI; Bell, 1995) to determine the extent to which the measures were correlated with each other and their relationships with 2 disorders characterized by disrupted object relations: borderline personality disorder (BPD) and depressive personality disorder (DPD). One hundred sixty-nine psychiatric outpatients and 171 undergraduate students were assessed with the Personality Disorder Interview for DSM-IV (Widiger, Corbett, Ellis, Mangine, & Tomas, 1995) and the Structured Clinical Interview for DSM-IV Axis II Disorders (First et al., 1997) for BPD and DPD. Modest correlations were observed among the diagnostic interviews with the BORRTI and the SCORS-G. An exploratory factor analysis yielded 3 distinct factors, 1 of which was mainly comprised of the BORRTI scales, whereas the 2 other factors were comprised of SCORS-G dimensions. Hierarchical multiple regressions demonstrated that the BORRTI accounted for greater variance among interview scores for both groups. However, the addition of SCORS-G variables incremented the variance accounted for in the BORRTI.