Lec13AttributableRelativeRisks(Revised07)

Lec13AttributableRelativeRisks(Revised07) - Relative and...

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Relative and Attributable Risks
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Absolute Risk Involves people who contract disease due to an exposure Doesn’t consider those who are sick but haven’t been exposed
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Calculating Excess Risk
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Relative Risk Definition: A measure of the strength of association based on prospective studies (cohort studies) .
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Determining Relative Risk
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Interpreting Relative Risk
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Relative Risk Calculations
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Relative Risk Calculations (cont.)
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Relative Risk in Case-Control Studies Can’t derive incidence from case- control studies Begin with diseased people (cases) and non-diseased people (controls) Therefore, can’t calculate relative risk directly But, we can use another method called an odds ratio
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Odds Ratio in Prospective (Cohort) Studies
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Odds Ratio in Case-Control Studies
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Odds Ratio in Case-Control Studies (cont.)
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When is the Odds Ratio a Good Estimate of Relative Risk? When cases are representative of diseased population When controls are representative of population without disease When the disease being studied occurs at low frequency
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REMEMBER !!!
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