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Related Experiment Videos

A manic-depressive symptom self-report in optical scanable format.

Henry A Glick1, Linda McBride, Mark S Bauer

  • 1Division of General Medicine and the Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, USA.

Bipolar Disorders
|October 4, 2003
PubMed
Summary
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The Internal State Scale (ISS) can be converted from a visual analogue scale (VAS) to a Likert format without losing precision. This change allows for automated scoring, making it easier to use the ISS in large studies.

Area of Science:

  • Psychiatry and Mental Health
  • Psychometrics
  • Clinical Assessment

Background:

  • The Internal State Scale (ISS) assesses manic and depressive symptoms in bipolar disorder.
  • Current visual analogue scale (VAS) format is labor-intensive for scoring.
  • A Likert format could enable automated scoring.

Purpose of the Study:

  • To compare the diagnostic properties of the ISS in Likert versus VAS formats.
  • To determine if converting the ISS to a Likert format results in a loss of precision.
  • To assess the feasibility of automated scoring for the ISS.

Main Methods:

  • Re-analyzed existing VAS-based ISS data by collapsing scores into Likert bins.
  • Collected new data administering the ISS in both VAS and Likert formats.

Related Experiment Videos

  • Assessed discriminant ability using kappas and receiver operator characteristic curves.
  • Evaluated within-subjects reliability across formats.

    • Main Results:

    • Discriminant ability remained unchanged between Likert and VAS formats.
    • Receiver operator characteristic curves and kappas showed no significant differences.
    • Within-subjects reliability was consistently high for both formats.

    Conclusions:

    • The Likert format of the ISS can be used without a loss of precision.
    • Automated scoring of the ISS is feasible with the Likert format.
    • This format is beneficial for studies with large sample sizes or frequent, long-term data collection.