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Racial Residential Segregation and Colorectal Cancer Mortality in the Mississippi Delta Region


Significant variation exists in the geographic distribution of CRC mortality rates at the county level in the Mississippi Delta Region. Among Black residents, the highest CRC mortality rates occurred in counties in Tennessee and Mississippi, whereas the highest CRC mortality rates among White residents occurred in Mississippi and Arkansas.

Figure 1.

Colorectal cancer mortality rates per 100,000 population among A, Black residents and B, White residents in counties in the Mississippi Delta Region, 1999–2018. Map created using ESRI ArcGIS version 10.5.1. Abbreviation: CRC, colorectal cancer.

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A U-shaped relationship between racial residential segregation and CRC mortality rates among Black residents was discovered in urban counties in the Mississippi Delta Region; however, the relationship between racial residential segregation and CRC mortality rates was not significant in all other stratified analyses (ie, Black CRC in rural counties, White CRC in urban counties, White CRC in rural counties).

Figure 2.

The effects of county urbanity and rurality on the relationship between Black–White residential segregation, as measured by the multilevel index of dissimilarity (MLID), which measures the spatial clustering of segregation (19), and colorectal cancer mortality rates among Black and White residents in Mississippi Delta region counties. A, Urban Black residents; B, Rural Black residents; C, Urban White residents; D, Rural White residents. Shading indicates 95% CIs.

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