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  Vol. 48 No. 8, August 1991 TABLE OF CONTENTS
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A Polydiagnostic Application of Operational Criteria in Studies of Psychotic Illness

Development and Reliability of the OPCRIT System

Peter McGuffin, MB, PhD, FRCP, FRCPsych; Anne Farmer, MD, MRCPsych; Ian Harvey, MB, MSc, MRCPsych
From the Department of Psychological Medicine, University of Wales College of Medicine, Cardiff (Drs McGuffin and Farmer); and Institute of Psychiatry, London (Dr Harvey).

Arch Gen Psychiatry. 1991;48(8):764-770.


Abstract

• An operational criteria checklist for psychotic illness and computer programs designed to be used in conjunction with it constitute the OPCRIT system. This provides a simple and reliable method of applying multiple operational diagnostic criteria in studies of psychotic illness. The development of the OPCRIT system and an assessment of reliability are described. Diagnostic agreement between three raters is excellent. Item-by-item agreement, although less good, still achieves reasonable reliability despite the problem of low base rates for some items.



Footnotes

Accepted for publication September 20, 1990.

Reprint requests to Department of Psychological Medicine, University of Wales College of Medicine, Heath Park, Cardiff CF4 4XN, Wales (Dr McGuffin).



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