Evidence-Based Therapy Calculator
Enter Numbers into the Following 2x2 Table and Click the "Compute Button" When Done:
Therapeutic Clinical Parameters
Absolute Risk Reduction (ARR):
Absolute Risk Increase (ARI):
Relative Risk Reduction (RRR):
Relative Risk Increase (RRI):
Number Needed to Treat (NNT):
Number Needed to Harm (NNH):