Evidence on age and ethnic status bias in factor scores and the comparison score for the AAMD adaptive behavior scale-school edition

Abstract

This report analyzes the contribution of gender, ethnic status, age, and school classification to the five factor scores and the comparison score of the Adaptive Behavior Scale-School Edition (ABS-SE). These factor scores were derived from extensive analysis of the performance of subjects of different ages and different levels of mental retardation. The comparison score evolved from discriminant analysis of the factor scores and is computed as a weighted sum of the three factor scores from Part One of the ABS-SE. The results of the ANOVAs conducted to test the main and interaction effects showed significant mean differences between normal, mildly retarded, and moderately to severely retarded subjects over the age range from 3 through 16 years on the ABS-SE factor and comparison scores. In general, there was no significant contribution of either gender or ethnic status to scores from ages 7 through 16, but there was a significant difference attributable to ethnic status with a meaningful amount of explained variance in the community and self-sufficiency and comparison scores of subjects aged 3–6. Although these differences were significant, children 3–6 years old classified as white did not necessarily perform better on all factor scores than those of minority ethnic groups. Discussion of the results in the context of contemporary criteria for test bias and of competing explanations for ethnic group differences in performance of young children on the ABS-SE follows the presentation of the findings. The results provide additional evidence for the validity of the ABS-SE factor and comparison scores and show that in general the factor and comparison scores are not affected by gender or ethnic status.