Interrater reliability. Intraclass correlation coefficients were calculated to examine reliability between raters in the measurement of correct/incorrect responses, on-task time, and number of stereotypic behaviors observed.Treatment versus control condition. The Wilcoxon signed rank test was used to compare differences between correct/incorrect responses, on-task time, and number of stereotypic behaviors in the traditional and exercise con- dition. This nonparametric test was used because the para- metric assumptions of homogeneity and normality were not met. The SPSS statistical program was used and the level of significance was set at α = .05.