Question 11 / 13:  What was the purpose of conducting subgroup analyses in this study?
Answer: 
To determine if the association between aspirin and cardiovascular disease as measured by the relative risk was the same across subgroups based on factors such as age, smoking status, body mass index etc.
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Randomized Controlled Trials (RCT), Relative Risk

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Attribution:  Janet, E.A. Forrester, Kwan Ho Kenneth Chui, Steven Cohen, Michael D. Kneeland, Alice Tang, David Tybor. Epidemiology and Biostatistics 2010. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/65/ (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA
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