The cruise ship owners contacted the CDC to conduct an in-depth analysis of the

Question

The cruise ship owners contacted the CDC to conduct an in-depth analysis of the possible modes of transmission of the Rotavirus in the cruise ship environment. CDC investigators interviewed all of the passengers on the last affected cruise (N=3,000) and obtained information on their activities. They found the following results: 1,000 passengers had gone swimming in the upper deck pool and 2,000 passengers had never gone swimming in the upper deck pool. 100 of the passengers who swam in the upper deck pool and 100 of the passengers who did not swim in this pool developed Rotavirus gastroenteritis during the cruise. FYI: The cruise lasted one week.     

8. What measure of disease frequency are you using to calculate the risk ratio and risk difference? (refer to cruise ship post)

9. What measure of association should be used to answer the question, “How many additional cases of Rotavirus gastroenteritis among all cruise passengers (N=3,000) was associated with swimming in the upper deck pool?”

Explanation / Answer

The incidence rate should be used to calculate risk ratio.

Risk ratio = (100/1000)/(100/2000)=2

Risk difference between swimming in the upper deck and not= (0.10-0.05)/0.05=100%.

Odds ratio should be used to answer the question. Odds ratio = (100/900)/(100/1900)=2.111

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.