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Article
July 1980

Schizophrenia-Primary Affective Disorder DiscriminationI. Development of a Data-Based Diagnostic Index

Author Affiliations

From the Veterans Administration Medical Center and the University of California School of Medicine, San Diego (Dr Fowler); the Veterans Administration Hospital and the University of Iowa College of Medicine, Iowa City (Drs Liskow and Tanna and Ms Lytle); and the University of Pittsburgh School of Medicine, Pittsburgh (Dr Mezzich).

Arch Gen Psychiatry. 1980;37(7):811-814. doi:10.1001/archpsyc.1980.01780200089010
Abstract

• A nine-variable diagnostic measure for discriminating schizophrenia and primary affective disorder was developed. The nine variables, which were selected by discriminant function analysis, reflect past and current symptomatology, duration of symptoms, and behavioral ratings. The measure was crossvalidated by a jackknife procedure that accurately classified nine of ten of the cases. Such accuracy suggests that brief, databased diagnostic instruments have considerable promise as practical checks of clinical diagnoses.

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