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Related Experiment Videos

WAIS-R test-retest reliability in a normal elderly sample.

W G Snow1, M C Tierney, M L Zorzitto

  • 1Sunnybrook Medical Centre, Toronto, Ont., Canada.

Journal of Clinical and Experimental Neuropsychology
|August 1, 1989
PubMed
Summary
This summary is machine-generated.

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Intelligence quotient (IQ) scores from the Wechsler Adult Intelligence Scale-Revised (WAIS-R) demonstrate strong 1-year test-retest reliability in older adults. However, subtest scores and the Verbal-Performance Discrepancy show lower reliability in this demographic.

Area of Science:

  • Neuropsychology
  • Gerontology
  • Psychometrics

Background:

  • Cognitive aging is a significant area of research.
  • Assessing cognitive function in older adults requires reliable instruments.
  • The Wechsler Adult Intelligence Scale-Revised (WAIS-R) is a widely used cognitive assessment tool.

Purpose of the Study:

  • To evaluate the 1-year test-retest reliability of WAIS-R IQ scores in older adults.
  • To determine the reliability of WAIS-R subtest scores and the Verbal-Performance Discrepancy in this population.

Main Methods:

  • A sample of 101 cognitively normal older individuals (mean age 67.1) was recruited.
  • Participants completed the WAIS-R, with retesting occurring after a 1-year interval.
  • Pearson correlation coefficients were calculated to assess reliability.

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Main Results:

  • High test-retest reliability was found for WAIS-R Full-Scale IQ (r=.90), Verbal IQ (r=.86), and Performance IQ (r=.85).
  • The median retest reliability for WAIS-R subtests was .71.
  • The test-retest reliability for the Verbal-Performance Discrepancy was .69.

Conclusions:

  • WAIS-R IQ scores are reliable for older normal individuals over a 1-year period.
  • Less confidence can be placed in the reliability of individual WAIS-R subtest scores and the Verbal-Performance Discrepancy in this age group.