The diagnostic interview for psychoses (DIP): development, reliability and applications
AuthorCastle, DJ; Jablensky, A; McGrath, JJ; Carr, V; Morgan, V; Waterreus, A; Valuri, G; Stain, H; McGuffin, P; Farmer, A
Source TitlePSYCHOLOGICAL MEDICINE
PublisherCAMBRIDGE UNIV PRESS
University of Melbourne Author/sCastle, David
AffiliationDepartment of Psychiatry
Document TypeJournal Article
CitationsCastle, D. J., Jablensky, A., McGrath, J. J., Carr, V., Morgan, V., Waterreus, A., Valuri, G., Stain, H., McGuffin, P. & Farmer, A. (2006). The diagnostic interview for psychoses (DIP): development, reliability and applications. PSYCHOLOGICAL MEDICINE, 36 (1), pp.69-80. https://doi.org/10.1017/S0033291705005969.
Access StatusOpen Access
© 2005 Cambridge University Press. Online edition of the journal is available at http://journals.cambridge.org/action/displayJournal?jid=PSM
BACKGROUND: We describe the development, reliability and applications of the Diagnostic Interview for Psychoses (DIP), a comprehensive interview schedule for psychotic disorders. METHOD: The DIP is intended for use by interviewers with a clinical background and was designed to occupy the middle ground between fully structured, lay-administered schedules, and semi-structured, psychiatrist-administered interviews. It encompasses four main domains: (a) demographic data; (b) social functioning and disability; (c) a diagnostic module comprising symptoms, signs and past history ratings; and (d) patterns of service utilization and patient-perceived need for services. It generates diagnoses according to several sets of criteria using the OPCRIT computerized diagnostic algorithm and can be administered either on-screen or in a hard-copy format. RESULTS: The DIP proved easy to use and was well accepted in the field. For the diagnostic module, inter-rater reliability was assessed on 20 cases rated by 24 clinicians: good reliability was demonstrated for both ICD-10 and DSM-III-R diagnoses. Seven cases were interviewed 2-11 weeks apart to determine test-retest reliability, with pairwise agreement of 0.8-1.0 for most items. Diagnostic validity was assessed in 10 cases, interviewed with the DIP and using the SCAN as 'gold standard': in nine cases clinical diagnoses were in agreement. CONCLUSIONS: The DIP is suitable for use in large-scale epidemiological studies of psychotic disorders, as well as in smaller studies where time is at a premium. While the diagnostic module stands on its own, the full DIP schedule, covering demography, social functioning and service utilization makes it a versatile multi-purpose tool.
KeywordsDiagnostic Interview for Psychoses; DIP; development; reliability; applications
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