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Area of Science:

  • Neurodevelopmental Disorders
  • Educational Psychology
  • Psychometrics

Background:

  • Autism Spectrum Disorder (ASD) impacts cognitive and academic functioning.
  • Reliable assessment tools are crucial for research and clinical evaluation in ASD.
  • The Wide Range Achievement Test-3 (WRAT-3) is frequently used in studies involving individuals with ASD.

Purpose of the Study:

  • To determine the test-retest stability of the WRAT-3 Reading, Spelling, and Arithmetic subtests.
  • To evaluate the reliability of WRAT-3 scores for individuals with autism spectrum disorder over time.

Main Methods:

  • Descriptive study design.
  • Participants: 31 males aged 6-22 years with ASD.
  • Two administrations of the WRAT-3 separated by an average of 31.8 months.

Main Results:

  • All WRAT-3 subtests demonstrated consistent test-retest stability.
  • Age, time between tests, and test form did not significantly affect stability.
  • Spelling and Arithmetic subtests showed acceptable stability; Reading subtest showed moderate stability for individuals with IQ > 75.

Conclusions:

  • The WRAT-3 Spelling and Arithmetic subtests are reliable for repeated measures in ASD research.
  • The WRAT-3 Reading subtest offers moderate reliability for longitudinal studies in this population.
  • Findings support the use of WRAT-3 for assessing academic achievement in individuals with ASD.