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Evaluating construct validity of the Slosson Visual-Motor Performance Test using the Rasch Measurement Model.

Ted Brown1, Carolyn Unsworth

  • 1Department of Occupational Therapy, School of Primary Health Care, Faculty of Medicine, Nursing and Health Sciences, Monash University-Peninsula Campus, Frankston, Victoria 3199, Australia. ted.brown@med.monash.edu.au

Perceptual and Motor Skills
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The Slosson Visual-Motor Performance Test

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Area of Science:

  • Pediatric occupational therapy
  • Psychometrics
  • Child development assessment

Background:

  • The Slosson Visual-Motor Performance Test is used to assess visual-motor skills in children.
  • Evaluating the psychometric properties of assessment tools is crucial for reliable clinical application.
  • The Rasch Measurement Model offers a robust framework for evaluating test properties.

Purpose of the Study:

  • To evaluate the construct validity of the Slosson Visual-Motor Performance Test.
  • To assess the test's scalability, dimensionality, differential item functioning (DIF) by sex, and item hierarchy using the Rasch Measurement Model.
  • To determine the suitability of the Slosson Visual-Motor Performance Test for clinical use.

Main Methods:

  • The Rasch Measurement Model was applied to data from 400 children aged 5-12 years.
  • Participants were recruited from six schools in Melbourne, Australia.
  • The Slosson Visual-Motor Performance Test involves copying 42 geometric designs.

Main Results:

  • Thirteen out of 42 items (31%) demonstrated poor measurement properties.
  • Analysis indicated issues with scalability and item hierarchy.
  • Differential item functioning by sex was also investigated.

Conclusions:

  • A significant proportion of items in the Slosson Visual-Motor Performance Test exhibit inadequate measurement properties.
  • The test's current form is not recommended for clinical use due to psychometric concerns.
  • Further revisions are needed to improve the validity and reliability of the Slosson Visual-Motor Performance Test.