MEANING
Variation in an exposure’s effect across levels of a third variable, on a specified effect scale.
Use it for
Use when an exposure’s effect changes across levels of another variable.Show why one average effect may conceal different outcomes across groups.
Words that belong together
- effect modification by age
- assess effect modification
- interaction and effect modification
On the page
The team tested effect modification by age rather than assuming the treatment worked equally in every group.
Nearby words
Word forms
- Base
- effect modification
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Usage notes
Effect modification describes genuine variation in an effect across strata and depends on the chosen scale; it is not itself a bias like confounding.
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