The odds ratio is always equal to or greater than the risk


The odds ratio is always equal to or greater than the risk ratio. Under which of the following conditions would the odds ratio be a good approximation of the risk ratio?

  • When the outcome is common.
  • When the exposure is common.
  • When the exposure is rare.
  • When the outcome is rare.

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Basic Statistics: The odds ratio is always equal to or greater than the risk
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