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Table 1 Comparison of student population at school to student population at home (geocoded) locations using discrete buffer distances from gasoline stations.

From: Improving environmental exposure analysis using cumulative distribution functions and individual geocoding

Distance School locations Geocoded home locations % Difference
Miles Feet No. of students % of students No. of students % of students  
0.25 1320 19,755 13.02% 12,444 8.20% 4.82%
0.50 2640 40,009 26.37% 43,434 28.63% -2.26%
1.00 5280 96,262 63.45% 100,695 66.37% -2.92%
2.00 10560 140,064 92.32% 133,519 88.01% 4.31%
4.00 21120 150,466 99.18% 148,306 97.76% 1.42%
  Total 151,709 100.00% 151,709 100.00%