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
2. Why do I offer this webinar for
free?
I offer free statistics webinars partly for fun and partly to build up goodwill for my consulting business,
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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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