Inside 20miles 20-30 miles 30-40 miles >40 miles p-value*
Percent of Total Population
Alabama 81.82% 12.92% 5.02% 0.25%  
Mississippi 61.30% 19.26% 13.11% 6.33%  
Tennessee 87.84% 9.20% 2.71% 0.24%  
All States 80.16% 12.60% 5.70% 1.54%  
Census Characteristics
Median age Race 38.81 40.08 40.84 40.11 0.0002
White 72.09% 72.11% 74.65% 70.41% 0.6986
AA 24.57% 25.30% 22.95% 26.80% 0.8019
Hispanic 2.71% 2.04% 2.01% 1.03% 0.0009
Median Per Capita Income $43,078 $35,272 $33,513 $32,141 <0.0001
Mean % graduated high school 71.35% 69.63% 69.74% 69.45% 0.2278
%Unemployment 5.95% 6.31% 6.16% 6.22% 0.3863
% below the poverty level 15.12% 17.56% 17.44% 18.54% 0.0009
ESRD Prevalence in rate/1,000,000 1,698 1,772 1,739 2,101 <0.0001
*Estimated from ANOVA for all variables except ESRD prevalence, which was compared among radius categories using a Poisson regression
Table 2: Comparison of census characteristics of zip codes by distance to nearest home dialysis unit