Background risk is the incidence of a condition absent the specific exposure, reflecting genetic, environmental, and idiopathic causes. It is the comparison point for assessing whether an exposure elevated risk.
Most diseases occur at some background rate.
Alternative Names:
Baseline Risk, Background Rate
Why it Matters?
Background rate is what makes individual attribution difficult, since a disease occurring commonly without any exposure may well have occurred in this plaintiff regardless. That is the foundation of the relative risk of two argument, and it is why conditions with high background rates such as heart disease and common cancers are harder to attribute than rare conditions like mesothelioma with minimal background incidence.
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Frequently asked questions
Why does background rate matter for attribution?
Which conditions attribute most cleanly?
