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Related Experiment Video

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Normative Reference Values for Crystallized-Fluid Discrepancy Scores for the NIH Toolbox Cognition Battery.

Grant L Iverson1,2,3,4, Charles E Gaudet1,2,3,4, Alicia Kissinger-Knox1,2,3,4

  • 1Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA, USA.

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This study provides normative data for Crystallized-Fluid cognitive discrepancy scores in adults. These scores help identify cognitive decline in individuals by comparing their performance to healthy peers.

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AssessmentNorms/normative studiesTest construction

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychometrics

Background:

  • The NIH Toolbox Cognition Battery (NIHTB-CB) Crystallized-Fluid discrepancy scores require normative data for clinical and research application.
  • Translating these scores into practice necessitates understanding their distribution in a healthy adult population.

Purpose of the Study:

  • To provide normative data for Crystallized-Fluid discrepancy scores derived from the NIHTB-CB.
  • To establish reference values for both age-adjusted standard scores (SSs) and demographically adjusted T-scores.

Main Methods:

  • Utilized data from 730 healthy adult participants in the NIHTB-CB standardization sample.
  • Calculated descriptive statistics, correlations, and reliability for Crystallized-Fluid discrepancy scores.
  • Generated percentile data stratified by gender, education, and Crystallized composite scores.

Main Results:

  • Crystallized-Fluid discrepancy scores ranged from -40 to 44 (SSs) and -29 to 27 (T-scores).
  • A score of SS=15 or T=11 represented the 16th percentile (1 SD below the mean).
  • A score of SS=21 or T=15 represented the 7th percentile (1.5 SD below the mean).

Conclusions:

  • Crystallized-Fluid discrepancy scores show potential as a within-person measure for detecting cognitive decline.
  • The normative data presented aids clinicians and researchers in interpreting these scores within a healthy adult sample.