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Research Article
Issue Date: March/April 2008
Published Online: March 01, 2008
Updated: April 30, 2020
Revised Knox Preschool Play Scale: Interrater Agreement and Construct Validity
Milena Jankovich; Jacqueline Mullen; Erin Rinear; Kari Tanta; Jean Deitz
Author Affiliations
  • Milena Jankovich, MOT Student, Division of Occupational Therapy, Department of Rehabilitation Medicine, University of Washington, Seattle
  • Jacqueline Mullen, MOT Student, Division of Occupational Therapy, Department of Rehabilitation Medicine, University of Washington, Seattle
  • Erin Rinear, MOT Student, Division of Occupational Therapy, Department of Rehabilitation Medicine, University of Washington, Seattle
  • Kari Tanta, PhD, OTR/L, FAOTA, is Clinical Assistant Professor, Department of Rehabilitation Medicine, University of Washington and Program Coordinator, Children’s Therapy Department, Valley Medical Center, Seattle
  • Jean Deitz, PhD, OTR/L, FAOTA, is Professor, Department of Rehabilitation Medicine, Box 356490, University of Washington, Seattle, WA 98195; deitz@u.washington.edu
Article Information
School-Based Practice / Children and Youth
Research Article   |   March 01, 2008
Revised Knox Preschool Play Scale: Interrater Agreement and Construct Validity
American Journal of Occupational Therapy, March/April 2008, Vol. 62, 221-227. https://doi.org/10.5014/ajot.62.2.221
American Journal of Occupational Therapy, March/April 2008, Vol. 62, 221-227. https://doi.org/10.5014/ajot.62.2.221
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Abstract

OBJECTIVE. Interrater agreement and construct validity of the Revised Knox Preschool Play Scale (RKPPS) were examined.

METHOD. Two separately trained raters evaluated 38 typically developing children, ages 36 to 72 months. For each child, the raters observed two 15-min free-play sessions.

RESULTS. For the overall play age, the scores of the two raters were within 8 months of each other 86.8% of the time; for the 4 dimension scores, they were within 12 months of each other 91.7% to 100% of the time; and for the 12 category scores, they were within one age level of each other 81.8% to 100% of the time. Construct validity results showed a general match between the children’s chronological ages and their overall play age scores.

CONCLUSIONS. Findings suggest that two raters can score the RKPPS with some consistency and that scores on this measure progress developmentally, thus supporting its construct validity.