Dismantling the monolith: ethnic origin, racial identity, and major depression among US-born Black Americans.

Purpose: Numerous investigations have sought to understand why Black Americans have a lower prevalence of major depressive disorder (MDD) than white Americans, yet fewer have explored within-racial group variation or its causes. Limited extant evidence indicates that US-born Caribbeans have higher levels of MDD relative to African Americans. Among African Americans, racial identity is considered protective against depression, yet it is unclear how it functions among Black Americans with recent immigrant origins. We examined the extent to which differential effects of racial identity on MDD by ethnic origin explain the elevated prevalence among US-born Caribbeans relative to all other US-born Black Americans. Methods: With data from the largest nationally representative study of Black mental health, log-binomial models assessed effect modification of ethnic origin (Caribbean, non-Caribbean) on the relationship between racial identity and MDD. Separate models evaluated four indicators of racial identity—"closeness to Black people," "importance of race to one's identity," "belief that one's fate is shared with other Black people," and "Black group evaluation." Results: Belief in "shared fate" was positively associated with MDD for US-born Caribbeans alone (PR = 3.43, 95% CI 1.87, 6.27). Models suggested that "importance of race" and "Black group evaluation" were detrimental for Caribbeans, yet protective for non-Caribbeans. "Closeness" appeared protective for both groups. Conclusion: Findings suggest that the protective effect of racial identity against MDD among US-born Black Americans may depend on both ethnic origin and the operationalization of racial identity. Results provide new insight into the role of racial identity on depression and suggest promising directions for future research. [ABSTRACT FROM AUTHOR]