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Description - Figure 6 - Lead Risk Management Strategy for Lead

Figure 6. Decline in the geometric mean of the blood lead levels in children related to a decline in the lead consumed in leaded gasoline in Ontario for 1983 to 1992 taken from Wang, S.T. et al. Clin Chem 1997; 43:1251-1252

Graph with several plots showing the geometric mean of the blood lead levels and the total amount of lead in leaded gasoline consumed in each year from 1983 to 1992. The linear regression analysis of the 22 blood lead summaries determined during that time shows a decline of 0.05 micromoles per litre per year. In a high-risk area of the Toronto Eastern Health Unit, the rate of decrease was 0.07 micromoles per litre per year. It declined at 0.04 micromoles per litre per year for the Toronto Western Health Unit from 1984 to 1988, and at 0.06 micromoles per litre per year for the City of Toronto from 1984 to 1992. The lead in leaded gasoline declined by an average of 3.6 x 108 grams per year between 1982 and 1990. The regression analysis also showed that the decline in blood lead levels overall was closely correlated to the decrease in the previous years' consumption of leaded gasoline. This close correlation was evident in the Toronto Eastern Health Unit, the Toronto Western Health Unit, and the City of Toronto.