The age-adjusted rate may be considered an average across the age-specific rates, but rather than being a simple average, it is a weighted average with each age-specific rate weighted by the proportion of people in that age group in the U.S. 2000 standard population.

Age-Adjusted Weights for U.S. 2000 Standard Population (11 Age Groups)

Grp #	Age Group	U.S. 2000 Population Projection (in thousands)	Weight
1	Under 1 Year	3,795	0.013818
2	1 - 4 Years	15,192	0.055317
3	5 - 14 Years	39,977	0.145565
4	15 - 24 Years	38,077	0.138646
5	25 - 34 Years	37,233	0.135573
6	35 - 44 Years	44,659	0.162613
7	45 - 54 Years	37,030	0.134834
8	55 - 64 Years	23,961	0.087247
9	65 - 74 Years	18,136	0.066037
10	75 - 84 Years	12,315	0.044842
11	85 Years and Over	4,259	0.015508

Population estimates at the county level are not available separately for Under 1 Year and 1-4 Years, so they are combined into an Under 5 Years age group.

Age-Adjusted Weights for U.S. 2000 Standard Population (10 Age Groups)

Grp #	Age Group	U.S. 2000 Population Projection (in thousands)	Weight
1	Under 5 Years	18,987	0.069135
2	5 - 14 Years	39,977	0.145565
3	15 - 24 Years	38,077	0.138646
4	25 - 34 Years	37,233	0.135573
5	35 - 44 Years	44,659	0.162613
6	45 - 54 Years	37,030	0.134834
7	55 - 64 Years	23,961	0.087247
8	65 - 74 Years	18,136	0.066037
9	75 - 84 Years	12,315	0.044842
10	85 Years and Over	4,259	0.015508