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FMB
Excess Risk
Excess Relative Risk = Relative Risk -1 =
Excess Absolute Risk: difference in risk between exposed and
unexposed (control) populations
Excess Relative Risk: proportion of Relative Risk (RR) due to
exposure
Excess Absolute Risk = a / (a+b) - c / (c + d)
Develop
Disease
Doesn’t
Exposed
a
b
Unexposed
c
d
a / (a+b) - c / (c + d)
c / (c+d)