Table 1.

Concordance between spatial patterns for high-risk areas based on WNV disease incidence versus WNV disease case counts for the county, zip code, and census tract scales, Colorado^*

WNV disease incidence	WNV disease case count
	High risk†	Other‡	% Concordance
	County scale
High risk†	6	6	50
Other‡	6	46	88
	Zip code scale
High risk†	23	51	31
Other‡	51	318	86
	Census tract scale
High risk†	158	33	83
Other‡	33	851	96

^*WNV = West Nile virus.

^†Spatial units with WNV disease case counts or WNV disease incidences falling within the fourth quartile for each spatial scale were considered high risk.

^‡Spatial units either lacking cases and with incidence of 0, or falling within the first to third quartile.