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The InterSePT scale for suicidal thinking reliability and validity.

J P Lindenmayer1, Pal Czobor, Larry Alphs

  • 1New York University School of Medicine, New York, NY, USA. lindenmayer@nki.rfmh.org

Schizophrenia Research
|August 2, 2003
PubMed
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The InterSePT Scale for Suicidal Thinking (ISST) reliably assesses suicidal ideation in schizophrenia patients. This validated instrument aids clinicians and researchers in evaluating suicide risk in this population.

Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Psychometrics

Background:

  • Schizophrenia and schizoaffective disorders are associated with high suicide risk.
  • Accurate assessment of suicidal thinking is crucial for effective intervention.
  • Existing assessment tools may require further validation in specific patient populations.

Purpose of the Study:

  • To evaluate the psychometric properties of the InterSePT Scale for Suicidal Thinking (ISST).
  • To determine the reliability and validity of the ISST for assessing suicidal ideation.
  • To establish the ISST as a dependable tool for research and clinical practice.

Main Methods:

  • Two studies were conducted involving patients diagnosed with schizophrenia or schizoaffective disorder.
  • Study 1 assessed interrater reliability using three independent raters.

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  • Study 2 examined internal reliability, construct validity, and discriminant validity in a larger cohort using the ISST and other established scales.

    • Main Results:

    • The ISST demonstrated high interrater reliability (ICC = 0.90) and internal consistency (Cronbach alpha = 0.88).
    • The ISST scores showed significant correlations with the Clinical Global Impression Scale for Severity of Suicidality (CGI-SS).
    • The scale effectively differentiated between varying levels of suicidality as measured by the CGI-SS.

    Conclusions:

    • The ISST is a reliable and valid instrument for assessing current suicidal thinking.
    • The scale is suitable for use by both clinicians and researchers.
    • The ISST can aid in the management of suicidal risk in patients with schizophrenia and schizoaffective disorder.