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A reliability study of BDAE-3 discourse coding.

Thomas W Powell1

  • 1Department of Rehabilitation Sciences, Louisiana State University Health Sciences Center in Shreveport, LA 71103-4601, USA. tpowel@lsuhsc.edu

Clinical Linguistics & Phonetics
|October 24, 2006
PubMed
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This study found poor reliability in coding aphasia discourse samples using the Boston Diagnostic Aphasia Examination. Novice coders showed less than 50% agreement, highlighting issues with the standardized procedure.

Area of Science:

  • Neurology
  • Speech-Language Pathology
  • Psycholinguistics

Background:

  • The Boston Diagnostic Aphasia Examination (BDAE) provides standardized discourse coding procedures.
  • The Cookie Theft illustration is commonly used for eliciting discourse samples in aphasia assessment.
  • Reliability of discourse coding is crucial for accurate aphasia diagnosis and treatment planning.

Purpose of the Study:

  • To evaluate the interjudge reliability of the BDAE's discourse coding procedure for the Cookie Theft illustration.
  • To identify factors contributing to poor agreement among novice examiners.
  • To propose methods for improving the reliability of discourse coding in aphasia.

Main Methods:

  • 14 novice examiners coded a transcribed discourse sample from the Cookie Theft illustration.

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  • Coding was performed using the standardized criteria from the third edition of the BDAE.
  • Interjudge agreement between novice coders and expert coders was calculated.

    • Main Results:

    • Interjudge agreement scores between novice and expert coders were poor, averaging less than 50%.
    • The standardized discourse coding procedure demonstrated low reliability in this evaluation.
    • Significant variability was observed in the coding of discourse samples by novice examiners.

    Conclusions:

    • The current discourse coding procedure of the BDAE exhibits insufficient reliability for clinical application.
    • Factors contributing to poor interjudge agreement require further investigation.
    • Developing improved training or modified coding criteria may enhance the reliability of aphasia discourse analysis.