What do all these numbers mean? Odds ratios, relative risks,
What do all these numbers mean? Odds ratios, relative risks,
and number needed to treat.
Steve Simon P.Mean Consulting
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3. Abstract
? The odds ratio and the relative risk are both measures of risk used for binary outcomes, but sometimes they can differ markedly from one another. The relative risk offers a more natural interpretation, but certain research designs preclude its computation.
4. Abstract
? Another measure of risk, the number needed to treat, provides comparisons on an absolute rather than relative scale and allow you to assess the trade-offs between effects and harms. No statistical experience is necessary.
5. Objectives
In this class you will learn how to: ? compute an odds ratio and a relative risk
from a two by two table; ? list the types of research designs where
the relative risk should not be computed, and ? make clinical judgments about the benefits and harms of a therapy using the number needed to treat/harm.
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