The Iowa Personality Disorder Screen: development and preliminary validation of a brief screening interview

Area of Science:

• Psychiatry
• Clinical Psychology
• Psychometrics

Background:

• Comprehensive personality disorder interviews are lengthy and costly, limiting their routine clinical application.
• A need exists for brief, sensitive screening tools to facilitate early identification of personality disorders.
• The Iowa Personality Disorder Screen (IPDS) was developed as a rapid assessment tool.

Purpose of the Study:

• To develop and validate the Iowa Personality Disorder Screen (IPDS) as a brief, efficient screening instrument for personality disorders.
• To assess the sensitivity and specificity of the IPDS in a clinical population.

Main Methods:

• The IPDS was developed using retrospective analyses of 1,203 Structured Interview for the Diagnostic and Statistical Manual of Personality Disorders-Revised (SIDP-R) interviews.
• A prospective validation study involved 52 nonpsychotic inpatients and outpatients diagnosed using the Structured Interview for the Diagnostic and Statistical Manual of Personality Disorders-IV (SIDP-IV).
• The IPDS was administered blindly to participants, and its diagnostic accuracy was evaluated.

Main Results:

• Retrospective analysis indicated that IPDS items possess good potential sensitivity and specificity.
• In the prospective validation, a five-item IPDS subset achieved 92% sensitivity and 79% specificity.
• Expanding the screen to seven items improved diagnostic accuracy, yielding an estimated 79% sensitivity and 86% specificity.

Conclusions:

• The Iowa Personality Disorder Screen (IPDS) is a promising, rapid tool for screening personality disorders.
• The IPDS can potentially reduce the need for longer, more intensive diagnostic interviews in many cases.
• Its efficiency makes the IPDS suitable for both research and routine clinical practice.