the Number Needed to Treat (NNT)

Treatment | given |
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not given |
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Total |

Risk of Outcome in Treated Group: | |

Risk of Outcome in Control Group: | |

Absolute Risk Reduction: | |

Relative Risk: | |

Relative Risk Reduction | |

Number Needed To Treat |

Number needed to treat (NNT)

The number of patients who must receive a particular therapy for one to benefit. You might tell a patient that an NNT of 10 means that the chance that he/she will benefit in this way from the treatment is 1 in 10. To calculate NNT use the calculator.

__FORMULAS__

NNT = 1 / ((C/D)-(A/B)

or

NNT= (ERC)(RRR) where RRR = RRR as entered or 1-RR

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