Answer the following question using the table below:

The 2x2 table is used to illustrate and present measures of association, as well as measures of impact of disease screening. Typically, the table created so that the exposure status is on the left (Y-axis) and the disease status is listed on the top (X-axis), although you will see 2x2 tables with the disease status on the left and the exposure status on the top. For each question, fill out the 2x2 table (8 points), calculate and interpret the RR (6 points), and calculate and interpret the OR (6 points).

	Ill	Well	Total
Exposed	a	b	a + b
Unexposed	c	d	c + d
Total	a + c	b + d	N

N = Total size of the sample

a = Individuals who are exposed and who have the disease

b = Individuals who are exposed but do not have the disease

c = Individuals who are not exposed but have the disease

d = Individuals who are not exposed and do not have the disease

Risk Ratio = a/(a+b)

c/(c+d)

Odds Ratio = ad

bc

Question #5:

Asbestos is the only known exposure associated with mesothelioma. In a study with a total of 350 study participants, 170 study participants were exposed to asbestos. By the end date of the study, 97 participants had developed mesothelioma.