Vineland-3 Measurement Non-Invariance in Children With and Without Intellectual and Developmental Disabilities.

Measurement of adaptive skills is important in the diagnosis, intervention planning, and progress monitoring of children with intellectual and developmental disabilities (IDD). Thus, ensuring accurate measurement, including measurement invariance, across children with and without IDD is critical. In this study, we evaluate the measurement invariance using multigroup confirmatory factor analysis (MG-CFA) of the Vineland-3 Comprehensive Interview (CIF) across children ages 6-21 years with and without IDD (N = 1,192) using archival data. Results showed that the Vineland-3 CIF exhibits configural invariance but may show some metric non-invariance in children with and without IDD. Suggestions for using the Vineland-3 CIF in this population are provided and future research and measure development needs are discussed.