Measures of effects



Copy and paste the following questions into a Word Document and include your answers beneath the
question. Save your document as your last name_Assignment_3″ and submit through this link. Each
question is worth 20 pts and will be graded based on the attached rubric. Write concisely and completely.
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Assignment #3
1) Define and give the formula for relative risk. How does it differ from an odds ratio?
2) A cohort study was conducted to study the association between coffee drinkers and anxiety in a
population-based sample of adults. Among 20,000 coffee drinkers, 500 developed anxiety. Among the
50,000 non-coffee drinkers, 250 cases of anxiety were observed. Develop a table to determine the relative
risk of anxiety associated with coffee use. What is the relative risk (RR)? What is the etiologic fraction?
Show your work including your 2×2 table.
3) Compare and contrast absolute vs relative effects. What are the measurements for each and when is
each used?
4) You are reviewing the results of a cohort study of vitamin D supplements and prostate cancer. The study
had an alpha level of 0.05 and 95% confidence interval (CI). The study findings report a relative risk (RR) of
0.75, P value = 0.20, 95% CI (1.45 – .60).
Interpret these results: comment on the RR, P value, and CI.



5) Compare and contrast intervention studies (controlled clinical trials vs. community interventions). What are advantages and disadvantages of controlled experimental vs. quasi-experimental