Foreign-born blacks no different from whites for odds of stroke.

Background: Blacks have higher risk for stroke than whites. However, combining foreign-born and US-born blacks could mask important health differences. We examined the relationship between nativity and stroke risk in US adults.

Methods: Data were obtained from the National Health Interview Survey, 2006-2014. Study population (n=189, 409) included non-Hispanic whites and non-Hispanic blacks born in the Caribbean, and non-Hispanic blacks born in Africa. Logistic regression models were used to assess the association between stroke and race/nativity, adjusting for covariates such as insurance status, hypertension, age and duration of US residence.

Results: Foreign-born blacks had similar odds of stroke (95% CI 0.58 to 1.60 for non-Hispanic blacks from the Caribbean, and 95% CI 0.17 to 1.10 for blacks from Africa), while US-born blacks had increased odds of stroke (95% CI 1.22 to 1.46) compared with non-Hispanic whites. When compared with US-born blacks, both non-Hispanic blacks from the Caribbean and Africa showed reduced odds of stroke: 95% CI 0.50 to 0.94 and 95% CI 0.21 to 0.75, respectively. After adding a race/nativity × age interaction term to the model however, compared with non-Hispanic whites, blacks from Africa aged <65 years had lower odds of stroke (95% CI 0.13 to 0.72) while blacks from the Caribbean had similar odds of stroke at all ages.

Conclusions: Homogenising 'Blacks' may mask important differences based on nativity. Public health prevention efforts should consider the heightened risk of stroke among younger US-born blacks and focus on primary prevention for immigrant blacks. Also, national surveys should incorporate more ethnicity-related variables.