NNH Calculator
Results
Number Needed to Harm (NNH):
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Data Source and Methodology
All calculations are based on standard statistical formulas. Please refer to the official guidelines for more details.
The Formula Explained
The Number Needed to Harm (NNH) is calculated as:
\( \text{NNH} = \frac{1}{\text{CER} - \text{EER}} \)
where CER is the Control Event Rate and EER is the Experimental Event Rate.
Glossary of Terms
- Control Event Rate (CER): The event rate in the control group.
- Experimental Event Rate (EER): The event rate in the experimental group.
- Number Needed to Harm (NNH): The number of patients that need to be treated for one additional patient to be harmed.
How It Works: A Step-by-Step Example
Suppose the Control Event Rate is 5% and the Experimental Event Rate is 2%. The NNH is calculated as:
\( \text{NNH} = \frac{1}{0.05 - 0.02} = 33.33 \)
Frequently Asked Questions (FAQ)
What is NNH?
NNH stands for Number Needed to Harm, a measure used in statistics to describe the impact of a treatment.
How do I interpret NNH?
A lower NNH indicates a higher risk of harm from the treatment. It is crucial to consider this in clinical decisions.