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9 April, 10:07

If the rate ratio (rr) and its 95% confidence interval for a cohort study is rr = 1.1 (0.7, 1.6), what is the most appropriate conclusion about the association between the exposure and the disease of interest?

a. the exposure is a risk factor for the disease

b. there is no statistically significant association between the exposure and the disease

c. the exposure is protective against the disease.

d. none of these

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  1. 9 April, 12:50
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    The correct answer is B.

    There's no statically significant association between the exposure and the disease. The risk ratio does not follow the normal distribution, even it does not depend on sample size in comparison groups. The natural rr is approximately normally distributed and is used to produce confidence interval which is for the relative risk.
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