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Table 4 Number of geographical units at various levels of aggregation with significant disparities in breast cancer mortality for African-American women.

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

Poverty Level   High SES (0-9.99%) Middle SES (10.00-19.99%) Low SES (≥20.00%) Total
Census Tract (4388) RD1 < 0 0 0 2 2
  RD > 0 34 54 190 278
  RD2 < 1 0 0 0 0
  RR > 1 0 0 0 0
Zip Code (2884) RD < 0 0 0 0 0
  RD > 0 2 8 12 22
  RR < 1 0 0 0 0
  RR > 1 3 0 0 3
County (254) RD < 0 0 0 0 0
  RD > 0 0 1 0 1
  RR < 1 0 0 0 0
  RR > 1 0 2 0 2
  1. Units are classified according to their socioeconomic status (SES) as measured by the percentage of population below the poverty threshold.
  2. 1The rate difference (RD) measurement is an absolute measure of breast cancer mortality rates for Black women compared to the Whites.
  3. 2The rate ratio (RR) measurement is a relative measure of breast cancer mortality rates for Black women compared to the Whites.