Abstract
Objectives The need for a brief screening tool for psychosis is widely recognized. The Community Assessment of Psychic Experiences (CAPE) is a popular self-report measure of psychosis, but a cut-off score that can detect those most likely to fulfill diagnostic criteria for psychotic disorder is not established. Methods A case-control sample from the Genetic Risk and Outcome of Psychosis Project study (N = 1375, healthy individuals, n = 507, and individuals with a psychotic disorder, n = 868), was used to examine cut-off scores of the CAPE with receiver operating curve analyses. We examined 27 possible cut-off scores computed from a combination of scores from the frequency and distress scales of the various factors of the CAPE. Results The weighted severity positive symptom dimension was most optimal in detecting individuals with a psychotic disorder (>1.75 cut-off; area under the curve = 0.88; sensitivity, 75%; specificity, 88%), which correctly identified 80% of the sample as cases or controls with a diagnostic odds ratio of 22.69. Conclusions The CAPE can be used as a first screening tool to detect individuals who are likely to fulfill criteria for a psychotic disorder. The >1.75 cut-off of the weighted severity positive symptom dimension provides a better prediction than all alternatives tested so far.
Original language | English |
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Article number | e1893 |
Number of pages | 12 |
Journal | International Journal of Methods in Psychiatric Research |
Volume | 30 |
Issue number | 4 |
Early online date | 31 Aug 2021 |
DOIs | |
Publication status | Published - Dec 2021 |
Keywords
- early detection
- psychotic experiences
- psychotic symptoms
- ROC
- schizophrenia
- ULTRA-HIGH RISK
- PSYCHOMETRIC PROPERTIES
- FIT INDEXES
- VALIDATION
- INSTRUMENT
- CRITERIA
- SAMPLE
- CAPE