OnlineMedEd Shared "Epidemiology and Stats - Risk" - 2 Picmonics
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Epidemiology and Stats - Risk
Relative Risk (RR)
Used in Cohort Studies
Risk of Developing Disease
a / (a + b)
Divided by /
c / (c + d)
When Low Prevalence Odds Ratio Approximates Relative Risk
Odds Ratio (OR)
Case Control Studies
Measures Association Between an Exposure and an Outcome
Odds of Exposure in Diseased (Sick) Group
a / c
Odds of Exposure in Healthy Group
b / d
=1 Exposure does not affect odds
> 1 Exposure increases disease
< 1 Exposure decreases disease
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