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Validation of the Korean version of the Eppendorf Schizophrenia Inventory as a screening measure to detect adolescents at ultra-high risk for psychosis

  1. Young-Chul Chung1,2,*,
  2. Nam-In Kang1,
  3. Yong-Jin Im3,
  4. Sung-Wan Kim4,
  5. In Hee Cho5,
  6. Young Moon Lee6,
  7. Jun Soo Kwon7

Article first published online: 5 JUN 2012

DOI: 10.1111/j.1751-7893.2012.00363.x

Issue

Early Intervention in Psychiatry

Early Intervention in Psychiatry

Volume 7, Issue 1, pages 71–79, February 2013

Additional Information

How to Cite

Chung, Y.-C., Kang, N.-I., Im, Y.-J., Kim, S.-W., Cho, I. H., Lee, Y. M. and Kwon, J. S. (2013), Validation of the Korean version of the Eppendorf Schizophrenia Inventory as a screening measure to detect adolescents at ultra-high risk for psychosis. Early Intervention in Psychiatry, 7: 71–79. doi: 10.1111/j.1751-7893.2012.00363.x

Author Information

  1. 1

    Department of Psychiatry, Research Institute of Clinical Medicine of Chonbuk National University and Chonbuk National University Hospital

  2. 2

    Department of Psychiatry, Chonbuk National University Medical School & Institute for Medical Sciences

  3. 3

    Clinical Trial Center, Chonbuk National University Hospital, Jeonju

  4. 4

    Department of Psychiatry, Chonnam National University Medical School, Gwangju

  5. 5

    Department of Psychiatry, Gachon University of Medicine and Science, Incheon

  6. 6

    Gyeonggi Provincial Mental Health Center, National Mental Health Commission,

  7. 7

    Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea

*Professor Young-Chul Chung, Department of Psychiatry, Chonbuk National University Medical School, Keumam Dong 634-18, Jeonju 561-712, Korea. Email: chungyc@jbnu.ac.kr

Publication History

  1. Issue published online: 28 JAN 2013
  2. Article first published online: 5 JUN 2012
  3. Received 11 July 2011; accepted 10 February 2012

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Keywords:

  • K-ESI;
  • psychosis;
  • schizophrenia;
  • screening;
  • ultra-high risk

Abstract

Aim: No validated self-report scale is available for use as a screening tool to detect non-help-seeking adolescents at ultra-high risk (UHR) for psychosis in a community setting. The study aims to examine the reliability and validity of the Korean version of the Eppendorf Schizophrenia Inventory (K-ESI) for assessing adolescents at UHR for psychosis in a community setting.

Methods: In the first study, to confirm the reliability and discriminant validity of the K-ESI, community sample (782 adolescents, 281 young adults, 122 early and middle-aged adults) and outpatients with schizophrenia (109) were recruited. A single cross-sectional survey was performed using the K-ESI for the community sample and the K-ESI and Positive and Negative Syndrome Scale for patients. In the second study, the Korean version of Youth Self Report (K-YSR) was administered initially to 1002 students. Of the 217 students whose scores were equal to or higher than the cut-off point of the K-YSR, 120 who agreed to an in-depth evaluation were interviewed using the Comprehensive Assessment of At-Risk Mental States to confirm the predictive validity of the K-ESI.

Results: The K-ESI showed good internal consistency and excellent test–retest reliability and discriminant validity. However, the factor structure in adolescents was substantially different from that of the original ESI. The best cut-off point for the K-ESI to identify UHR adolescents was 29, with a sensitivity of 77% and a specificity of 70%.

Conclusion: The results revealed that the K-ESI can be used as a valid and reliable instrument to identify adolescents at UHR for psychosis in a community setting.

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