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Directions: Please answer the following questions from the Lee et al. study (attached PDF). It is not required to cite the article, however if you cite outside material please use AMA style.
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1. What makes the randomized controlled trial (RCT) the “gold standard” of study designs? What is the number 1 key feature that makes it the most robust design?
2. What was the main exposure and main outcomes in the study?
3. How many people were successfully recruited to participate in the study and how were they recruited?
4. What were the selection criteria for the people in the study? In other words, what characteristics did all of the people in the study have in common?
5. What does Table 1 tell us about the intervention group and the control group? Were they different or the same? How do you know?
6. Calculate the relative risk (Show your work and round your final answer to two (2) decimal places) of having a major cardiovascular event among those who were exposed to Vitamin E and among those who were not exposed. (Hint: you’re only calculating one statistic, which is the RR. See Table 2.) Does the relative risk you calculated match the relative risk reported in Table 2?
7. Table 3 shows the relative risks of cardiovascular disease and cancer according to baseline characteristics in the women’s health study. Was age an effect modifier in the relationship between Vitamin E and major cardiovascular events (assuming age was not a confounder)? How do you know whether age was an effect modifier or not based on the information presented in Table 3?
8. Write a conclusion for the relationship between Vitamin E and major cardiovascular event for people aged 65+ (See Table 3). Use the RR in your statement just like we have done previously.
9. Did the authors use intention-to-treat analysis or actual treatment received analysis? Why was it important to conduct the analysis in the way the authors chose? What did this type of analysis ensure for the researchers about any confounding variables?
10. Do you agree with the author’s conclusions about not recommending Vitamin E to healthy women? What group might benefit?
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