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Table 2 Accuracy of crop exposure classification for Agricultural Health Study addresses in 14 counties in Iowa by geo-location data source, overall and by rural status

From: Accuracy of residential geocoding in the Agricultural Health Study

   Sensitivity Specificity ORobsb
>0 Acres of crop within specified distance from home Prevalence (%)a Address-matched E911 Address-matched E911 Address-matched E911
Overall        
Corn        
  250 m 97.6 99.5 99.7 82.8 91.0 1.67 1.79
  500 m 99.8 99.9 100.0 88.9 88.9 1.47 2.00
Soybean        
  250 m 85.7 97.4 98.7 89.5 95.3 1.73 1.85
  500 m 97.1 99.6 99.8 92.5 97.9 1.77 1.88
Alfalfa/hay        
  250 m 55.7 84.9 95.4 88.8 95.8 1.62 1.86
  500 m 78.5 94.8 98.9 81.9 95.2 1.64 1.91
Other row crops        
  250 m 68.9 89.5 97.1 87.2 94.6 1.60 1.86
  500 m 87.6 97.8 99.3 88.0 93.9 1.72 1.90
Rural a        
Corn        
  250 m 99.8 99.9 99.9 28.6 85.7 1.22 1.46
  500 m 100.0 100.0 100.0 0± 0± - -
Soybean        
  250 m 98.3 99.2 99.6 52.7 83.6 1.36 1.64
  500 m 99.9 100.0 100.0 0± 50.0 - -
Alfalfa/hay        
  250 m 56.2 80.5 94.4 86.9 95.5 1.54 1.84
  500 m 74.1 92.5 98.6 79.3 94.7 1.59 1.90
Other row crops        
  250 m 78.2 88.4 97.0 79.6 92.2 1.44 1.79
  500 m 89.8 97.4 99.5 84.0 92.3 1.63 1.91
Non-rural a        
Corn        
  250 m 93.5 98.7 99.3 86.1 91.3 1.69 1.81
  500 m 99.6 99.8 100.0 100.0 100.0 1.50 2.00
Soybean        
  250 m 62.2 92.2 96.2 92.5 96.3 1.74 1.86
  500 m 91.9 99.0 99.4 93.8 98.6 1.80 1.88
Alfalfa/hay        
  250 m 54.7 93.2 97.2 92.4 96.4 1.78 1.91
  500 m 86.7 98.6 99.3 91.1 97.0 1.80 1.91
Other row crops        
  250 m 51.6 92.4 97.3 93.6 96.6 1.80 1.91
  500 m 83.7 98.6 99.0 92.7 95.8 1.85 1.89
  1. ±Specificity = 0 because there were no unexposed addresses.
  2. aPrevalence of crops near addresses and rural status were based on rooftop locations.
  3. bWhere ORtrue =2.0.