Table 4.

Age-, Race-, and Sex-standardized Annual Incidence (per 100,000) of Nonmobile Parkinson Disease Cases Living in Urban Counties With No Versus High Reported Copper, Manganese, and Lead Metal Release, US Medicare Beneficiaries, 2003

Exposure Category	Incidence	95% Confidence Interval	Relative Risk	95% Confidence Interval
No reported copper, manganese, or leada	274.0	226.8, 353.5
High reported copper release	304.2	276.0, 336.8	1.11	0.94, 1.31
High reported manganese release	489.4	368.3, 689.5	1.78	1.54, 2.07
High reported lead release	285.7	249.3, 337.5	1.04	0.88, 1.23

^aLess than 100 pounds (45.36 kg) of reported copper, manganese, or lead release.