Screening for Personality Disorders: A Three-Item Screener From the Inventory of Interpersonal Problems (IIP-3)

Are We Thinking about the Same Disorder? A Trifactor Model Approach to Understand Parents' and Their Adolescents' Reports of Borderline Personality Pathology

Multiple informant assessment is the norm when evaluating borderline personality pathology (BPP) in adolescence, especially by including reports from both parents and adolescents. However, these reports tend to be discrepant, and it is unclear how to integrate. The current study used a trifactor model to isolate sources of variance in parents' and adolescents' reports of BPP due to their shared and unique perspectives in a sample of 652 inpatient adolescents (63% female; Mage = 15.31, SD = 1.45) and their parents (81% mothers). Consensus/agreement was characterized by the externalizing features of BPP whereas idiosyncratic views of adolescent BPP covered the full latent BPP construct, suggesting that simple aggregation of parent and adolescent reports is inappropriate. Measurement invariance suggested that unique perspectives were characterized by slightly different operationalizations of BPP and response biases for specific features of BPP. Attachment security and parents' interpersonal problems predicted shared and unique perspectives differently for female and male adolescents. Lastly, we found that shared and unique perspectives differentially predicted interview based BPP, length of stay, and adolescent mentalizing. In sum, findings replicate previous evidence of parent-child informant discrepancy in youth psychopathology, broadly, and provide insights specific to BPP. Discussion includes practical recommendations for assessment and interpretation of BPP assessment.

Validation of the Three-Item Screener for Personality Disorders From the Inventory of Interpersonal Problems (IIP-3)

We previously developed a three-item screener for identifying respondents with any personality disorder (PD) using the Inventory of Interpersonal Problems (IIP). The current goal was to examine the convergent validity of the IIP-3 with other PD screeners and diagnostic tools and to investigate its relationship to measures of adult attachment and emotion regulation. The sample consisted of participants from five studies (total N = 852), with data from collateral informants available for a subsample (N = 353). Despite its brevity, the IIP-3 showed moderate to strong relationships with other longer PD screeners, with PD symptom scores from the Structured Interview for DSM-IV Personality (SIDP-IV), and with a global rating of PD severity. It was most sensitive to the stylistic aspects of PD typical of the traditional DSM cluster B (dramatic, expressive) PDs. These results emerged with data from both participants and informants, although correlations using informant data were generally smaller.