Psychiatry Investig.  2021 Aug;18(8):736-742. 10.30773/pi.2020.0456.

Validation of the Korean Version of the Psychosis Screener to Identify Patients With Psychosis

Affiliations
  • 1Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
  • 2Department of Psychiatry, National Medical Center, Seoul, Republic of Korea
  • 3Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
  • 4Neuropsychiatric Epidemiology Research Unit, School of Population and Global Health, The University of Western Australia, Perth, Australia

Abstract


Objective
This study aimed to validate the Korean version of a short screening tool for psychosis as the first stage in finding undiagnosed psychosis in the community.
Methods
The sample contained 126 consecutive psychiatric outpatients in National Medical Center, Seoul, Korea, between July 20 and July 22, 2020. The Psychosis Screener (PS) comprises 7 items covering psychotic symptoms. The presence of each psychotic symptom was determined by a trained mental health professional and coded “yes” or “no.” Two psychiatrists reviewed the medical records independently and extracted the ICD-10-based diagnoses. Any differences between the two clinicians were resolved by consensus, and the agreed diagnosis was used as a gold standard in the study.
Results
Among 126 psychiatric outpatients who were enrolled in a consecutive manner during the study period, the proportion of psychosis was 15.1%. The PS showed 78.9% sensitivity and 72.0% specificity when the optimal cut-off was 2, indicating that a score of 2 or more on the screener identified a likely case of psychosis. The area under the curve for the PS was 0.78 (95% CI: 0.67–0.87).
Conclusion
The Korean version of the PS has an ability to discriminate between those who meet the diagnostic criteria for psychosis and those who do not in a high-prevalence group.

Keyword

Psychosis, Psychosis screener, Validation, Sensitivity, Specificity, Area under the curve
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