Table 2.

Maternal and familial characteristics by cluster estimation method and type

Methods	Filtering Sizes or Maximum Spatial Cluster Sizes (miles)	Significance	Total Births within Cluster	Maternal Ethnicity within Cluster			Average Percentage of Mothers having Some College Education within Cluster	Average Percentage of Families Below Poverty level
				Caucasian	African American	Others
Spatial filtering	0.40	≥ 0.95% level	1,250	1.4%	98.3%	0.2%	13.9%	48.7%
	0.50	≥ 0.95% level	2,509	2.1%	97.6%	0.3%	16.2%	40.6%
	0.60	≥ 0.95% level	7,288	6.5%	92.4%	1.1%	19.6%	36.0%
SaTScan	0.40	P1 (most likely) = 0.002	141	0.0%	100.0%	0.0%	14.9%	49.7%
		P2 (secondary) < 0.05	311	1.0%	98.4%	0.6%	9.6%	61.2%
	0.50	P1 (most likely) = 0.001	184	0.0%	100.0%	0.0%	12.5%	31.9%
		P2 (secondary) < 0.05	437	5.0%	93.8%	1.1%	16.9%	34.7%
	0.60	P1 (most likely) = 0.001	268	0.0%	99.6%	0.4%	11.6%	58.1%
		P2 (secondary) < 0.05	820	3.0%	96.3%	0.6%	13.2%	43.2%