Table 2.

Population Socioeconomic Characteristics According to 2000 US Census Data Compared by Metal Exposure Category Region, US Medicare Beneficiaries, 2003

Socioeconomic Variable	Cumulative Metal Exposure Category				P Value
	Low Copper, Lead, and Manganese	High Copper	High Manganese	High Lead
High school graduates, %	81.32	83.69	80.21	80.14	0.26
Married males, %	56.48	57.27	57.74	56.85	0.90
Married females, %	51.67	51.56	52.30	52.20	0.97
Median household income, dollarsa	43,701.60	47,044.35	40,617.43	40,696.09	0.07
Median home value, dollarsa	129,176.74	119,426.21	96,475.00	131,272.09	0.64
Individuals below poverty line, %	11.75	9.62	11.29	13.21	0.08

^aIn 2000 US dollars.