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  • Title: The paranoid quotient. A BPRS ratio for exploring subtypes in schizophrenia.
    Author: Karson CN, Bigelow L.
    Journal: Acta Psychiatr Scand; 1986 Jan; 73(1):39-41. PubMed ID: 3962701.
    Abstract:
    A paranoid quotient developed from two items of the Brief Psychiatric Rating Scale, suspiciousness and disorganized speech, is presented as a novel method for estimating the degree of paranoia of chronic schizophrenic patients. The mean quotient for paranoid schizophrenic patients was 70 which significantly exceeded that of non-paranoid patients (mean quotient = 47, P less than 0.002). This difference proved more discriminatory than that obtained by examining the constituent items alone. Hence, the quotient strategy offers a promising way to quantify paranoid symptoms in a population of patients in whom diagnostic subtyping is often difficult.
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