Abstract
INTRODUCTION: White matter hypointensities (WMHs) are associated with cognitive decline and dementia. However, it remains unknown how race, ethnicity, and depression influence WMHs. This study examined the interactive effects of race/ethnicity and depression on WMHs and cognition. METHODS: Data from the National Alzheimer's Coordinating Center included 2411 older adults (773 Whites with and 1360 Whites without depression and 89 Blacks with and 189 Blacks without depression). Linear regressions assessed WMH differences across race/ethnicity and depression groups and the associations between WMH burden and cognition. RESULTS: Black older adults with depression showed greater global and regional WMH burden than Black older adults without depression, and depression significantly influenced the relationship between WMHs and cognitive impairment. Similar results were observed for Hispanic older adults; however, these findings were not observed in White older adults. DISCUSSION: These findings suggest that race and depression may jointly influence cerebrovascular disease burden as well as its associations with cognition in aging and dementia.