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Self-determination is a key predictor of positive life outcomes for people with and without disabilities across the life course. The Self-Determination Inventory: Adult Report (SDI:AR) is a self-report measure designed to assess self-determination in adults. This study examined the psychometric properties of the SDI:AR including internal consistency, factor structure, and measurement invariance across demographic variables of gender (female and male), life stage (early and middle adulthood), and disability status (with and without disabilities). Results demonstrated excellent internal consistency (>0.90) across the full sample and all subgroups. Using a single-factor model, measurement invariance was supported across all demographic group comparisons, allowing for meaningful comparisons of latent means and variances. There is a need to further explore how intersectional identities influence self-determination, particularly among adults with disabilities. Continued validation with underrepresented groups is essential to ensure the SDI:AR aligns with the full range of adult experiences. Implications for research and practice are discussed.
Townsend et al. (Sun,) studied this question.