An odds ratio of =
> 0.46 means that a treatment has halved the likelihood of something =
> happening....is that correct??
http://www.jr2.ox.ac.uk/bandolier/band25/b25-6.html
This explanation (Swot's corner: What is an odds ratio) is from Bandolier
which is a very good site for evidence-based information.
Odds ratios are harder to understand (the odds in the treated or exposed
group divided by the odds in the control group) than relative risk. An OR of
0.46 means just that, whereas a Relative Risk of 0.46 means the risk is
about halved.
When events are rare, there is little difference between ORs and RRs.
Most of the time people use these terms without being too precise about
them.
Lisa Amir
MBBS, MMed, IBCLC in Melbourne, Australia
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