Question

D Question 5 1 pts A study was conducted to assess the association between benzene exposure and leukemia. 40,000 workers occupationally exposed to benzene and 52,000 workers not occupationally exposed to benzene were followed for 10 years. At the end of the ten years, there were 792 cases of leukemia among benzene-exposed workers and 92 cases among the unexposed workers. Before you begin answering the questions, use the information above to fill in the following contingency table: EXPOSUREDISEASE TOTAL 40,000 52,000 92,000 YES NO YES NO TOTAL 884 91,116 Which of the following is an advantage of this type of study? O A. It's inexpensive. OB. It's practical for rare diseases. 0) c.lt permits direct observation of risk. D. Attrition is beneficial.

Answer 1

No 1. This is a prospective cohort study and its advantages are it permits direct observation of risk.

And these type of study is good to study on rare exposure, not on rare disease.

No.2 Based on the study design Relative risk is the best measure to use.

It is otherwise known as risk ratio, it is the probability of outcome to an exposed group to probability of an outcome with unexposed group.

No.3 The study shows that in the exposed group 792 affected

(792/40,000)100= 1.92%

Means 1.92% of peoples are affected in exposed group

Using the same calculation

0.17% of people's are affected in non exposed group

Relative risk is 1.92/0.17 =11.29

According you answer it's (b) 11

It means the risk of leukaemia is 11 times greater in benzene-exposed worker than non exposed.