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Nih toolbox premorbid ability adjustments: Application in a traumatic brain injury sample.

James A Holdnack1, David S Tulsky1, Jerry Slotkin1

  • 1The Center for Health Assessment Research and Translation, University of Delaware.

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Reading-adjusted scores improve estimation of premorbid cognitive ability in traumatic brain injury (TBI) patients. These scores offer a more individualized assessment than demographic data alone, aiding in identifying cognitive difficulties post-TBI.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Rehabilitation Medicine

Background:

  • Estimating premorbid cognitive ability is crucial for detecting cognitive changes after brain injury.
  • Word reading tests are commonly used but may not fully capture individual cognitive baselines.
  • The National Institutes of Health Toolbox Cognition Battery (NIHTB-CB) offers fluid cognitive tests.

Purpose of the Study:

  • To develop and validate reading-adjusted scores for NIHTB-CB fluid tests.
  • To evaluate the clinical utility of these reading-adjusted scores in individuals with traumatic brain injury (TBI).

Main Methods:

  • Development sample (n=843) from NIHTB-CB standardization data.
  • Validation sample (n=158) with mild/moderate or severe TBI.
  • Four adjustment models used: age-only, demographic-only, age-and-reading, and demographic-and-reading.

Main Results:

  • Premorbid ability estimation varied significantly across the four reference models.
  • All models differentiated between comparison and TBI groups at a group level.
  • Individual performance varied based on estimated premorbid ability.

Conclusions:

  • Premorbid ability significantly impacts the identification of cognitive deficits following TBI.
  • Reading-referenced scores provide a more individualized estimate of premorbid effects than demographic adjustments alone.
  • Models showed high disagreement rates, especially for individuals with lower premorbid ability, highlighting the need for careful clinical interpretation.