number needed to treat : number of people you need to give experimental treatment to prevent 1% from getting the disease of interest.
Attributable Risk= difference of treated and untreated groups(to medicine)
NNT= 1/AR
number needed to harm : number of people you need to expose to risk factor in order to cause 1% to acquire the disease of interest.
AR= difference of exposed and unexposed (to risk factors)
NNH= 1/AR
number needed to treat : number of people you need to give experimental treatment to prevent 1% from getting the disease of interest.
Attributable Risk= difference of treated and untreated groups(to medicine)
NNT= 1/AR
number needed to harm : number of people you need to expose to risk factor in order to cause 1% to acquire the disease of interest.
AR= difference of exposed and unexposed (to risk factors)
NNH= 1/AR
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