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By Statistician (anonymous) | Posted October 17, 2012 at 06:40:09
Although the odds ratio is not the same as relative risk, the odds ratio is a good estimate of relative risk under certain circumstances and does not over-accentuate the reported effect. This happens when the incidence rate is small in the unexposed, some say less than 10% is acceptable. In the cycling helmet paradigm relative to this article, this is the percentage of new head trauma related deaths among cyclists who don't wear helmets. That percentage is certainly much less than 10% and thus the study's conclusions stand. Think about it this way, of 100 unhelmeted cyclists will 10 or more die of head trauma? BTW, the Wikipedia entry calls this the rare disease assumption.
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