A Study Was Conducted to Assess the Association Between L-Tryptophan

A study was conducted to assess the association between L-tryptophan use and the development of Eosinophilia-Myalgia Syndrome (EMS) .  Patients with EMS were asked about the use of products containing L-tryptophan during the last 6 months.  At the same time, people without EMS were randomly selected from the same population where the patients came from, and asked about their experience with L-tryptophan containing products within the last 6 months.  The study showed that the use of L-tryptophan is significantly associated with EMS.  Which of the following measures of association are the investigators most likely to report?

A) Relative risk
B) Median survival
C) Exposure odds ratio
D) Relative rate
E) Prevalence odds ratio

Correct Answer:

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