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Table 3 Frequency of different classes of poverty levels at the census tract, zip code, and county levels.

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%)
Census Tract (4338) N 1613 1445 1330
  Percentage 36.76 32.93 30.31
Zip Code (2884) N 1045 1181 658
  Percentage 36.23 40.95 22.82
County (254) N 22 175 57
  Percentage 8.66 68.90 22.44
  1. Percentage was derived by the number of geographic units for each SES level divided by the total number of units at each geographic level.