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Table 7 Comparison of results from block centroid population assignment method with original travel speed settings (% change reflects change compared to zip code intersection method)

From: Measuring geographic access to health care: raster and network-based methods

Block centroid Raster % Change Network % Change
Underserved population 489,588 -78 191,420 -85
Limited access population 288,118 -84 0 -100