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Table 1 Distribution of positional error (meters) by geo-location data sources for Agricultural Health Study addresses in 14 counties in Iowa, overall and by rural status a

From: Accuracy of residential geocoding in the Agricultural Health Study

Positional error (m)
Geo-location data comparison N Min Mean SD Median (IQR) Max Percent ≤100 m Percent ≥1000 m
Overall         
  Address-matched vs. Rooftop 5064 4 312 956 90 (47–215) 15171 53 6
  E911 vs. Rooftop 5064 7 62 83 39 (22–61) 1276 87 0.1
Rural a         
  Address-matched vs. Rooftop 3296 4 444 1159 147 (78–353) 15171 34 9
  E911 vs. Rooftop 3296 11 83 93 51 (39–83) 1199 80 0.1
Non-rural         
  Address-matched vs. Rooftop 1768 6 66 151 45 (27–68) 4694 89 0.3
  E911 vs. Rooftop 1768 7 23 35 19 (17–23) 1275 99 0.1
  1. aRural status was defined as a rooftop location outside of the U.S. Census 2000 Incorporated Places boundary.