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Inventory of interpersonal problems: a three-dimensional balanced and scalable 48-item version
1Department of Behavioural Science in Medicine, University of Oslo, Norway. tore.gude@basalmed.uio.no
Journal of Personality Assessment
|July 6, 2000
Summary
This study refined the Inventory of Interpersonal Problems (IIP) using principal component analysis, yielding three robust dimensions: Assertiveness, Sociability, and Interpersonal Sensitivity. These dimensions effectively differentiate personality disorders, improving interpersonal problem assessment.
Area of Science:
- Psychiatry
- Psychometrics
- Clinical Psychology
Background:
- Interpersonal relating is a key area in psychiatry.
- The Inventory of Interpersonal Problems (IIP) is a self-rating scale for assessing interpersonal difficulties.
- Previous analyses of the IIP faced challenges with a General Complaint factor.
Purpose of the Study:
- To refine the psychometric properties of the IIP through principal component analysis (PCA).
- To develop balanced, bipolar subscales for the IIP.
- To validate these subscales by assessing their ability to discriminate between personality disorders.
Main Methods:
- Principal component analysis (PCA) was applied to the IIP.
- A subset of 48 items was selected to form new subscales.
- The new subscales were validated by their ability to discriminate between personality disorder categories.
Main Results:
- A three-dimensional structure of the IIP emerged, comprising Assertiveness, Sociability, and Interpersonal Sensitivity.
- The refined 48-item IIP subscales demonstrated improved psychometric properties, with lower internal correlations and reduced General Complaint factor confounding.
- All subscales significantly discriminated between individuals with and without personality disorders, supporting external validity.
Conclusions:
- The refined three-dimensional structure of the IIP provides a psychometrically sound and reliable measure of interpersonal functioning.
- The new subscales offer a more focused and less confounded assessment of interpersonal problems.
- This validated structure enhances the utility of the IIP in clinical psychology and psychiatry for diagnosing and understanding personality disorders.