Calculating NNT:

Another way of looking at it

Another way of looking at it

•In this situation, we should look for a way to invert our number.

•We know that we can divide any number by 1 without altering it. So ARR = ARR/1. So think of ARR as a fraction.

•Now think of the number of successful treatments beyond baseline expectation as the unit on top of the fraction (i.e. ARR) and the number of treated patients as the unit on the bottom.