Question

A prospective cohort study of 18,540 adult women was designed to determine the relationship between obesity, defined as BMI ≥ 30, and colon cancer. After ten years of follow-up, the study produced the following results:

	Colon Cancer	No Colon Cancer	Total
BMI ≥30	339	3,866	4,205
BMI < 30	422	13,913	14,335
	761	17,779	18,540

Using data on participants in this cohort study, a group of researchers set out to examine whether smoking was associated with colon cancer among obese women. They therefore selected 100 obese patients with colon cancer and 300 obese patients without colon cancer as controls. Of the 100 participants with colon cancer, 20 reported smoking while 30 of the 300 participants without colon cancer smoked.

The value for the measure of association you indicated in the previous question (IDR, CIR, OR, or attributable risk difference) is:

• A. 2.0
• B. 1.39
• C. 0.2
• D. 2.25

Answer 1

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