NNT and absolute risk reduction Flashcards
1
Q
What is Number needed to treat?
A
indicates how many patients would require an intervention to reduce the expected number of outcomes by one
2
Q
how is NNT calculated
A
1/(Absolute risk reduction)
3
Q
(Number who had particular outcome with the intervention) / (Total number who had the intervention) =?
A
Experimental event rate (EER)
4
Q
(Number who had a particular outcome with the control/ (Total number who had the control)
A
Control event rate (CER)
5
Q
How can the Absolute risk reduction be calculated using EER and CER
A
if the outcome of the study is undesirable then ARR = CER - EER
if the outcome of the study is desirable then ARR= EER - CER
6
Q
A
