Of 6,000 employees at a company making asbestos-based insulation, 350 developed
ID: 273722 • Letter: O
Question
Of 6,000 employees at a company making asbestos-based insulation, 350 developed mesothelioma, a rare form of lung cancer that has been epidemiologically linked to asbestos inhalation. Of the 6,000 employees, 470 worked off site for their entire time with the company and the remainder worked on site (where the asbestos was handled). Of these, 5,000 worked for 40 months, 78 worked for 50 months, and the rest worked 20 months with the company. What is the person-time rate (incidence density) of injuries? Interpret this measure.
Explanation / Answer
Rate: the number of new cases of disease during a period of time divided by the person-time-at-risk Person-time: estimate of the actual time-at-risk in years, months, or days that all persons contributed to a study
Total mesothelioms cases = 370
Total time of asbestoss exposed = 40+50+20 = 110
therefore the person time rate is 370/110
= 3.36/month
Therefore the person time rate is the 3.36/month
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