## Step 3: Calculating Age-adjusted Rates

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To calculate the age-adjusted rate, we must bring in the standard populations. The standard population column shows the projected population in the United States distributed among the 19 age groups in the year 2000. Proportions based on the standard population are calculated and shown in the column, "Age Distribution of Std Pop". These will be used as the weights.

Finally, the age-adjusted rate is calculated by multiplying each crude rate by the appropriate weight and summing the products. The result, 400.3, is shown in the last row of the right-most column.

Age Count Population Crude Rate US 2000
Standard Populations
Age Distribution
of Std Pop

00 years
29
139,879 20.7 3,794,901 0.013818 0.29
01-04 years
87
553,189 15.7 15,191,619 0.055316 0.87
05-09 years
67
736,212 9.1 19,919,840 0.072532 0.66
10-14 years
71
770,999 9.2 20,056,779 0.073031 0.67
15-19 years
87
651,390 13.4 19,819,518 0.072167 0.96
20-24 years
177
639,159 27.7 18,257,225 0.066478 1.84
25-29 years
290
676,354 42.9 17,722,067 0.064530 2.77
30-34 years
657
736,557 89.2 19,511,370 0.071045 6.34
35-39 years
1,072
724,826 147.9 22,179,956 0.080762 11.94
40-44 years
1,691
700,200 241.5 22,479,229 0.081852 19.77
45-49 years
2,428
617,437 393.2 19,805,793 0.072117 28.36
50-54 years
2,931
516,541 567.4 17,224,359 0.062718 35.59
55-59 years
2,881
361,170 797.7 13,307,234 0.048454 38.65
60-64 years
2,817
259,440 1,085.8 10,654,272 0.038794 42.12
65-69 years
2,817
206,204 1,366.1 9,409,940 0.034264 46.81
70-74 years
2,744
172,087 1,594.5 8,725,574 0.031772 50.66
75-79 years
2,634
142,958 1,842.5 7,414,559 0.026998 49.74
80-84 years
1,884
99,654 1,890.5 4,900,234 0.017843 33.73
85+ years
1,705
92,692 1,839.4 4,259,173 0.015509 28.53
All Ages
 274,633,642
1.000000
400.3

Note: these values were calculated using the SEER 9 registry database from the Nov 2006 submission.

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