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The diagnostic interview for psychoses (DIP): development, reliability and applications
D J Castle1, A Jablensky, J J McGrath
1University of Melbourne and Mental Health Research Institute, Melbourne, Australia.
Psychological Medicine
|October 1, 2005
Summary
The Diagnostic Interview for Psychoses (DIP) is a reliable tool for assessing psychotic disorders. It is suitable for large or small studies, offering comprehensive data on symptoms and services.
Area of Science:
- Psychiatry and Clinical Psychology
- Mental Health Assessment Tools
Background:
- Development of the Diagnostic Interview for Psychoses (DIP), a comprehensive interview schedule for psychotic disorders.
- Designed as a semi-structured interview for clinicians, balancing structured and semi-structured approaches.
- Covers demographics, social functioning, diagnostic criteria, and service utilization.
Purpose of the Study:
- To describe the development, reliability, and applications of the Diagnostic Interview for Psychoses (DIP).
- To provide a versatile tool for assessing psychotic disorders in various research settings.
Main Methods:
- The DIP includes modules for demographic data, social functioning, diagnostic symptoms, and service utilization.
- Utilizes the OPCRIT computerized diagnostic algorithm for multiple diagnostic criteria.
- Administered via on-screen or hard-copy formats by clinicians.
Main Results:
- The DIP demonstrated ease of use and good acceptance in field studies.
- Inter-rater reliability for ICD-10 and DSM-III-R diagnoses was good.
- Test-retest reliability showed high agreement (0.8-1.0) for most items.
- Diagnostic validity was high, with 9 out of 10 cases agreeing with the SCAN gold standard.
Conclusions:
- The DIP is suitable for large-scale epidemiological studies and time-constrained smaller studies of psychotic disorders.
- The full DIP schedule offers a versatile, multi-purpose tool beyond its diagnostic module.