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Validity and reliability of the CAPE: a self-report instrument for the measurement of psychotic experiences in the general population

Authors

  • M. Konings,

    1. Department of Psychiatry and Neuropsychology, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht University, Maastricht, the Netherlands
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  • M. Bak,

    1. Department of Psychiatry and Neuropsychology, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht University, Maastricht, the Netherlands
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  • M. Hanssen,

    1. Department of Psychiatry and Neuropsychology, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht University, Maastricht, the Netherlands
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  • J. Van Os,

    1. Department of Psychiatry and Neuropsychology, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht University, Maastricht, the Netherlands
    2. Division of Psychological Medicine, Institute of Psychiatry, London, UK
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  • L. Krabbendam

    1. Department of Psychiatry and Neuropsychology, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht University, Maastricht, the Netherlands
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Lydia Krabbendam, Department of Psychiatry and Neuropsychology, Maastricht University, PO Box 616 (KAP2), 6200 MD Maastricht, the Netherlands.
E-mail: l.krabbendam@sp.unimaas.nl

Abstract

Objective:  General population longitudinal cohort studies have demonstrated the prognostic validity of self-reported psychotic experiences, but data on reliability and cross-validation with interview-based measures of these experiences are sparse. This study tested the reliability and validity of the Community Assessment of Psychic Experiences (CAPE42).

Method:  At baseline, the CAPE42 was used to measure the subclinical psychosis phenotype in a general population sample (n =  765). At follow-up (mean interval: 7.7 months), the Structured Interview for Schizotypy, Revised (SIS-R), the Brief Psychiatric Rating Scale (BPRS), and the CAPE42 were administered (n = 510).

Results:  Baseline self-reported dimensions of psychosis were specifically and independently associated with their equivalent interview-based dimension at follow-up (standardized effect sizes of 0.4–0.5) and with their equivalent self-reported measure (standardized effect sizes of 0.6–0.8).

Conclusion:  The results indicate that self-reported dimensions of psychotic experiences in general population samples appear to be stable, reliable and valid.

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