Table 3.

Multi-variable regression model of discrepancy-distance

		Ratio of discrepancy-distance medians* (95% CI)
Poverty in census tract	Two-fold increase	0.87 (0.85 – 0.91)
Density of census tract	Two-fold increase	0.90 (0.88 – 0.91)
Multi-stage reference file	Local Parcels	1.00 (reference)
	Local Roads	0.89 (0.82–0.96)
	TIGER-based	0.47 (0.44–0.51)

Discrepancy-distance indicates distance between multi-stage and single-stage coordinates for the same address; TIGER indicates Topologically Integrated Geographic Encoding and Referencing system line files, this includes NAVTEQ and Dynamap reference files

* Ratios lower than one indicate that a category or characteristic was associated with a smaller discrepancy-distance (closer agreement between the two geocoding methods)