Inter Rater Reliability and Concurrent Validity of the Preschool Play Scale with Preschool Children with Autism Spectrum Disorders
This study examined whether the Revised Knox Preschool Play Scale (PPS R) was reliable and valid for use in assessing play behavior of preschoolers with autism spectrum disorder (ASD) Inter rater reliability of the PPS R was investigated. Comparing scores on the Vineland Adaptive Behavior Scales (VABS) on 61 children determined concurrent validity of the PPS R. Intraclass Correlation and Spearman's Rank Order Correlation coefficients revealed the PPS R had high inter rater reliability (r .94) and correlated significantly (r .52, p< .01) with the total score of the VABS, respectively. Results support the PPS R is a reliable and valid measurement of play behavior for preschoolers with ASD.