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Table 2 Number of geographic units (census tract, zip code, and county) with non-zero population and mortality data by race.

From: Identification of racial disparities in breast cancer mortality: does scale matter?

Geographic Level   White Non-Hispanics Race African-Americans Hispanics
Census Tract (4,388) Population 4,382 4,322 4,375
  Mortality 3,518 1,341 1,592
  Percentage 80.28% 31.03% 36.39%
Zip Code (2,884) Population 1,889 1,620 1,866
  Mortality 1,284 597 674
  Percentage 67.97% 36.85% 36.12%
County (254) Population 253 209 253
  Mortality 239 126 155
  Percentage 94.47% 60.29% 61.26%
  1. The ratio of these two numbers, referred to as percentage, indicates the much smaller proportion of units where at least one death was observed for minority populations.