Accuracy of residential geocoding in the Agricultural Health Study

Table 3 Accuracy of animal feeding operations (AFO) exposure classification for Agricultural Health Study addresses in 14 counties in Iowa, by geo-location data source, overall and by rural status

		Sensitivity		Specificity		OR_obs^b
≥1 AFO within distance of address	Prevalence (%)^a	Address-matched	E911	Address-matched	E911	Address-matched	E911
Overall
2 km	41.6	65.7	98.5	75.5	99.0	1.33	1.97
5 km	91.8	95.4	99.9	48.1	99.3	1.30	1.98
Rural ^a
2 km	52.3	63.6	98.4	67.7	98.3	1.23	1.95
5 km	92.0	94.4	99.9	39.0	98.9	1.20	1.98
Non-rural
2 km	21.7	75.2	99.2	84.3	99.8	1.46	1.99
5 km	91.4	97.2	99.9	63.8	100.0	1.49	1.98

^a≥1 AFO present within specified distance from home was based on rooftop location.
^bWhere OR_true =2.0.

ISSN: 1476-072X