How can you determine if a variable is an effect modifier?

In epidemiology and statistics, determining if a variable is an effect modifier involves evaluating its interaction with the exposure and outcome of interest. An effect modifier is a variable that modifies the relationship between the exposure and outcome, meaning it alters the effect of the exposure on the outcome. To identify an effect modifier, statistical tests such as stratified analysis or regression models can be used. By comparing the effect estimates of the exposure-outcome relationship in different strata defined by the potential effect modifier, one can assess if there is a significant variation in the effect estimates across the strata. If the effect estimates differ substantially, then the variable can be considered an effect modifier, indicating that it influences the association between the exposure and the outcome.

This mind map was published on 13 October 2023 and has been viewed 126 times.