Question

Standardized mortality ratio question:

8. Take a look at the following data. Do lawn maintenance workers have a greater risk of dying of skin cancer than the general population? Use the method we used in class to determine the answer. Show your calculations. lawn maintenance Age workers 20-24 23,983 25-29 18,347 30-34 9,376 35-39 5,239 40-44 12,862 45-49 23,891 50-54 40,782 55-59 15,026 60-64 8,472 General Population (per 100,000) death rate from skin cancer 1,348 1,890 3,269 5,815 8,451 6,341 3,580 4,723 6,125 Observed deaths from skin cancer in lawn maintenance workers 275 331 254 296 1,238 1,387 1,564 691 486

Answer 1

For age group, 20-24

Mortality of general population = 1348/100000 x 100 = 1.348%

& 1.348 % of lawn worker = 1.348/100 x 23 983 = 323

For age group 25-29

Mortality of general population = 1890/100000 x 100 = 1.89%

& 1.89 % of lawn worker = 1.89/100 x 18347 = 346

For age group 30-34

Mortality of general population = 3269/100000 x 100 = 3.269%

& 3.269 % of lawn worker = 3.269/100 x 18347 = 600

For age group 35-39

Mortality of general population = 5815/100000 x 100 = 5.815%

& 5.815 % of lawn worker = 5.815/100 x 5239 = 305

For age group 40-44

Mortality of general population = 8451/100000 x 100 = 8.451%

& 8.451 % of lawn worker = 8.451/100 x 12862 = 1087

For age group 45-49

Mortality of general population = 6341/100000 x 100 = 6.341%

& 6.341 % of lawn worker = 6.341/100 x 23891 = 1514

For age group 50-54

Mortality of general population = 3580/100000 x 100 = 3.58%

& 3.58 % of lawn worker = 3.58/100 x 40782 = 1460

For age group 55-59

Mortality of general population = 4723/100000 x 100 = 4.723%

& 4.723 % of lawn worker = 4.723/100 x 15026 = 710

For age group 60-64

Mortality of general population = 6125/100000 x 100 = 6.125%

& 6.125 % of lawn worker = 6.125/100 x 8472 = 519

Age	Observed death rate in lawn workers	Calculated death rate in lawn workers
20-24	275	323
25-29	331	346
30-34	254	600
35-39	296	305
40-44	1238	1087
45-49	1387	1514
50-54	1564	1460
54-59	691	710
60-64	486	519
Total	6522	6864

From the above table ,

Mostly Workers of age group 40-44 & 50-54 have more mortality risk than the general population.

But, We can see that Total Calculated value is more than Total Observed value so lawn worker have lesser risk as compared to General Population.