Calculating NNT:  Final Touches

•Now if we take the inverse (i.e. flip our fraction over) and calculate 1/ARR, we get a number where the units are flipped. Thereby, this number has the number of treated patients as the unit on top of the fraction (i.e. ARR) and the number of successful treatments beyond baseline expectation as the unit on the bottom. This is exactly how we defined NNT.