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Development and Psychometric Validation of the Cyprus Aphasia Screening Test (CAST).

Marina Charalambous1,2, Phivos Phylactou1,2,3, Maria Kambanaros1,2

  • 1Department of Rehabilitation Sciences, School of Health Sciences, Cyprus University of Technology, Limassol 3036, Cyprus.

Brain Sciences
|January 28, 2026
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Summary

The Cyprus Aphasia Screening Test (CAST) is a new, reliable tool for detecting post-stroke aphasia in Cyprus. It shows strong psychometric properties and accuracy, aiding clinicians in diagnosis.

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aphasiapsychometric testingscreening teststroke

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Area of Science:

  • Neurology
  • Speech-Language Pathology
  • Psychometrics

Background:

  • Aphasia screening is crucial for post-stroke care.
  • Cyprus lacks a standardized, validated aphasia screening tool.
  • The Cyprus Aphasia Screening Test (CAST) was developed to address this gap.

Purpose of the Study:

  • To present the characteristics of the CAST.
  • To evaluate the psychometric properties of the CAST.
  • To assess the diagnostic accuracy of the CAST for post-stroke aphasia.

Main Methods:

  • A cross-sectional study with 99 participants: 43 with stroke-aphasia, 21 with stroke-no aphasia, and 35 healthy controls.
  • Assessed internal consistency, test-retest reliability, interrater reliability, and known-groups validity.
  • Correlated CAST scores with the Greek Boston Diagnostic Aphasia Examination and used ROC analysis for cut-off determination.

Main Results:

  • CAST demonstrated excellent internal consistency (Cronbach's α > 0.967) and high reliability (ICC ≥ 0.983).
  • Verified known-groups validity (p < 0.001) and significant correlation with the Greek BDAE (p < 0.001).
  • ROC analysis (AUC = 0.97) identified a cut-off of 36/40 for aphasia detection.

Conclusions:

  • The CAST is a reliable, clinician-administered screening tool with strong psychometric properties.
  • It effectively identifies post-stroke aphasia and differentiates between affected and unaffected individuals.
  • The CAST is suitable for quick bedside administration, benefiting Greek-speaking populations in Cyprus.