Parent-adolescent concordance on the Revised Diagnostic Interview for Borderlines (DIB-R) and the Childhood Interview for Borderline Personality Disorder (CI-BPD).

While the degree of concordance between parent and adolescent self-report of internalizing and externalizing pathology is well studied, virtually nothing is known about concordance in borderline pathology and the implication of parent-adolescent discrepancies for outcomes. The present study aimed to (1) examine discrepancies between parents and adolescents on two interview-based measures of borderline personality disorder (BPD)-the Revised Diagnostic Interview for Borderlines (DIB-R22 ) and the Childhood Interview for Borderline Personality Disorder (CI-BPD23 ); and (2) investigate the implications of discrepancies for clinical outcomes. Diagnostic concordance on the DIB-R and CI-BPD showed rates of 82% and 94% respectively, with lower concordance demonstrated for dimensionally scored variables. Standardized difference scores between adolescent and parent reports on both borderline measures were significantly correlated with few interview-based axis I diagnoses as reported by parents, but not adolescents themselves. Implications regarding the use of each measure for the assessment and diagnosis of borderline personality disorder are discussed. Copyright © 2017 John Wiley & Sons, Ltd.