An epidemiologic study was conducted at a high school to determine if participation in sports were associated with methicillin-resistant Staphylococcus aureus (MRSA) skin infections. The investigators identified 127 laboratory-confirmed MRSA skin infection cases and 381 controls from the high school. Based on review of school records it was determined that among the MRSA cases, 12 were on the wrestling team and only 4 controls were on the wrestling team. What type of study design is this? What is the best measure of association, in the above study, to use to examine the exposure disease relationship? how many more times likely were high school students with a MRSA skin infection to be on the wrestling team than students who did not have MRSA? Report your answer rounded to the 10th decimal place.

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