Validity and reliability of the CAPE: a self-report instrument for the measurement of psychotic experiences in the general population
Version of Record online: 23 JAN 2006
Acta Psychiatrica Scandinavica
Volume 114, Issue 1, pages 55–61, July 2006
How to Cite
Konings, M., Bak, M., Hanssen, M., Van Os, J. and Krabbendam, L. (2006), Validity and reliability of the CAPE: a self-report instrument for the measurement of psychotic experiences in the general population. Acta Psychiatrica Scandinavica, 114: 55–61. doi: 10.1111/j.1600-0447.2005.00741.x
- Issue online: 23 JAN 2006
- Version of Record online: 23 JAN 2006
- Accepted for publication December 8, 2005
- psychotic disorders;
- reliability and validity;
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.