Question 3 (part 2) · LDEK · Basics of medical statistics
It is true that in the case of rare diseases the odds ratio for rare diseases is:
- A. approximately equal to the relative risk.
- B. twice as big as the relative risk.
- C. twice smaller than the relative risk.
- D. inversly proprtional to the relative risk.
- E. impossible to determine.
Hint
Compare the expressions a/b and a/(a+b) when the number of diseased people is tiny relative to the non-diseased.
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