STPF3 Practice Test

1Single Choice

A cohort study evaluates the association between serum vitamin D level and the risk of developing multiple sclerosis. The reported relative risk is 0.62 (95% CI 0.41 - 0.88). Which of the following best describes the clinical meaning of this finding?

A.A 62% reduction in absolute risk of multiple sclerosis is attributable to higher vitamin D levels
B.Higher vitamin D levels are associated with a 38% lower relative risk of multiple sclerosis, and the result is statistically significant
C.Because the relative risk is less than 1, the result is not statistically significant
D.The result indicates that 62% of patients with higher vitamin D levels will not develop multiple sclerosis

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