Step 2: Calculating Age-adjusted Rates

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Next we use population data with the counts to calculate crude rates for each of the 19 age groups. The populations must be for the same geographic area, sex, race, and years (the sum of the black female populations for 2000-2004 in the SEER 9 registries). In this step, we are calculating the crude, age-specific rates. A crude incidence rate is the number of new cancers of a specific site/type occurring in a specified population during a year, usually expressed as the number of cancers per 100,000 population at risk. It is calculated using the following formula:

formula for crude rate

Age Count Population Crude Rate
00 years
29
139,879 20.7
01-04 years
87
553,189 15.7
05-09 years
67
736,212 9.1
10-14 years
71
770,999 9.2
15-19 years
87
651,390 13.4
20-24 years
177
639,159 27.7
25-29 years
290
676,354 42.9
30-34 years
657
736,557 89.2
35-39 years
1,072
724,826 147.9
40-44 years
1,691
700,200 241.5
45-49 years
2,428
617,437 393.2
50-54 years
2,931
516,541 567.4
55-59 years
2,881
361,170 797.7
60-64 years
2,817
259,440 1,085.8
65-69 years
2,817
206,204 1,366.1
70-74 years
2,744
172,087 1,594.5
75-79 years
2,634
142,958 1,842.5
80-84 years
1,884
99,654 1,890.5
85+ years
1,705
92,692 1,839.4

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

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