Number Needed to Treat (NNT) Calculator
Calculate NNT, ARR, RRR, and other clinical measures from 2x2 data
Treatment Group:
Control Group:
About NNT
NNT: Number of patients to treat to prevent 1 additional bad outcome.
NNH: Number of patients to treat before 1 is harmed.
ARR: Control Rate - Treatment Rate
NNT: 1 / ARR
Lower NNT = more effective treatment