The relation between self-determination and intellectual functioning is complex, as other contextual factors may also play significant roles in explaining variability in self-determination. This study used meta-analytic techniques to assess how self-determination measures vary between people with disabilities classified as having intellectual disability (ID) or not, and contextual variables that moderate this relation. The literature search yielded 16 eligible studies, whose variables of interest were coded and analyzed. The results showed that when comparing self-determination measures among disability classification groups, gender, disability label and race/ethnicity were associated with the effect size estimation. These findings empirically support the relevance of personal variables when understanding self-determination levels and their impact in the operational classification of ID.