The construct validity of the Inventory of Psychotic‐Like Anomalous Self‐Experiences (IPASE) as a measure of minimal self‐disturbance: Preliminary data

Aim The Inventory of Psychotic‐Like Anomalous Self‐Experiences (IPASE) is a self‐report measure of minimal self‐disturbance. The aim of the current report was to assess the construct validity of the scale by examining its convergent validity with the gold‐standard measure of minimal self‐disturbance...

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Bibliographic Details
Published in:Early intervention in psychiatry 2019-06, Vol.13 (3), p.686-691
Main Authors: Nelson, Barnaby, Li, Emily, Cicero, David C., Gawęda, Łukasz, Hartmann, Jessica A., Koren, Danny, Polari, Andrea, Whitford, Thomas J., Lavoie, Suzie
Format: Article
Language:English
Subjects:
Adolescent
Adult
Checklist
Control equipment
Convergence
Correlation
Female
Humans
Interview, Psychological
Male
Metacognition
Middle Aged
Personality Inventory - statistics & numerical data
phenomenology
prodrome
psychometrics
Psychometrics - statistics & numerical data
psychopathology
Psychosis
Psychotic Disorders - diagnosis
Psychotic Disorders - psychology
Reproducibility of Results
Self Concept
Self Report
Signs and symptoms
ultra‐high risk
Validation studies
Validity
Young Adult
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Summary:Aim The Inventory of Psychotic‐Like Anomalous Self‐Experiences (IPASE) is a self‐report measure of minimal self‐disturbance. The aim of the current report was to assess the construct validity of the scale by examining its convergent validity with the gold‐standard measure of minimal self‐disturbance, the Examination of Anomalous Self‐Experience (EASE), and its discriminant validity. Method The sample consisted of 46 participants (21 ultra‐high risk for psychosis patients, 14 first episode psychosis patients, 11 healthy controls). Correlations between the clinical instruments were examined. Results The IPASE correlated strongly with general psychopathology and positive psychotic symptoms, moderately with negative symptoms, and weakly with manic symptoms. The strongest correlation (r = 0.92) was apparent between IPASE and EASE total scores. Conclusion These preliminary data indicate construct validity of the IPASE, demonstrating both convergent and discriminant validity. The IPASE may be suitable as a screener measure for minimal self‐disturbance, but should not be used as a replacement to measure the construct of minimal self‐disturbance, which requires considerable psychopathological sophistication.
ISSN:1751-7885
1751-7893
DOI:10.1111/eip.12711