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Thomas A. Widiger, PhD; Allen Frances, MD; Timothy J. Trull, MA

Arch Gen Psychiatry. 1987;44(8):741-745.

Abstract
• Because the social-interpersonal symptoms of schizotypal personality disorder have been more useful than the cognitive-perceptual in identifying the biological relatives of schizophrenics, it has been recommended that the schizotypal DSM-III-R (or DSM-IV) criteria be revised to emphasize the social-interpersonal items. This study determined whether the social-interpersonal items would be more efficient than the cognitive-perceptual in diagnosing schizotypal personality disorder in patients presenting to a clinical setting. In contrast to studies conducted in nonclinical samples, we found that the cognitive-perceptual items were equally and at times more important than the social-interpersonal items to the diagnosis of patients with schizotypal personality disorder. We demonstrate that the value of an item depends in part on the particular differential diagnosis at issue.

Author Affiliations
From the Department of Psychology, University of Kentucky, Lexington (Dr Widiger and Mr Trull); and the Department of Psychiatry, New York Hospital—Cornell Medical Center (Dr Frances).

Footnotes
Accepted for publication Nov 3, 1986.

Reprint requests to 115 Kastle Hall, Psychology Department, University of Kentucky, Lexington, KY 40506-0044 (Dr Widiger).

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