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Victoria Symptom Validity Test: A Systematic Review and Cross-Validation Study.

Zachary J Resch1,2, Troy A Webber3, Matthew T Bernstein4

  • 1Department of Psychiatry, University of Illinois College of Medicine, Chicago, IL, USA. zachary.resch@my.rfums.org.

Neuropsychology Review
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Summary

The Victoria Symptom Validity Test (VSVT) demonstrates adequate diagnostic accuracy as a performance validity test (PVT). Total item accuracy showed the strongest psychometric properties, supporting its clinical use.

Keywords:
AssessmentPerformance validityPsychometricsVSVTVictoria symptom validity test

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Area of Science:

  • Neuropsychology
  • Psychometrics
  • Clinical Assessment

Background:

  • The Victoria Symptom Validity Test (VSVT) is a widely used performance validity test (PVT).
  • Existing literature has methodological limitations regarding VSVT index consensus and optimal cut-scores.
  • Generalizability of VSVT findings is restricted by these limitations.

Purpose of the Study:

  • To systematically review existing VSVT validation studies.
  • To perform cross-validation of VSVT indices in an independent clinical sample.
  • To establish optimal cut-scores for VSVT indices.

Main Methods:

  • Systematic literature search identifying 17 validation studies (7 simulation, 7 differential prevalence, 3 known-groups).
  • Cross-validation in a sample of 200 mixed clinical neuropsychiatric outpatients.
  • Receiver Operating Characteristic (ROC) curve analyses to determine classification accuracy and optimal cut-scores.

Main Results:

  • Total item accuracy exhibited the strongest psychometric properties (62% sensitivity/88% specificity) at a cut-score of ≤40.
  • ROC analyses indicated moderate classification accuracy for all VSVT indices (AUCs .73-.81).
  • Derived cut-scores supported previous findings for Easy (≤22) and Total (≤40) item accuracy, but diverged for Difficult item accuracy.

Conclusions:

  • VSVT validity indicators possess adequate diagnostic accuracy for use as a psychometrically sound PVT in clinical settings.
  • Total item accuracy is a robust index, with a cut-score of ≤40 recommended.
  • Caution is advised for patients with dementia or significant working memory deficits due to potential false positives.