C6 experimental designs
3 important questions on C6 experimental designs
What variable could be a confounder?
- Is the potential confounding variable a risk factor/protective for the outcome
- is the variable associated with the exposure
- is the variable not an intermediate between exposure and outcome?
Which variable could be an intermediate?
A variable which is in the causal pathway of the disease
When does the effect measure modification occure
Occurs when the association between an exposure and outcome (the 'effect') differs across levels of a third variable (the 'effect modifier')
in contrast to confounding, effect measure modification is a fact of nature, life, society or culture.
in contrast to confounding, effect measure modification is a fact of nature, life, society or culture.
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