To calculate the Number Needed to Treat (NNT):
\[ NNT = \frac{1}{ARR} \]
Where:
To calculate the Absolute Risk Reduction (ARR):
\[ ARR = CER - EER \]
Where:
Number Needed to Treat (NNT) is a statistical measure used in clinical research to quantify the effectiveness of a medical intervention or treatment. It represents the number of patients who need to be treated to prevent one additional outcome of interest, such as an adverse event or a specific health outcome. NNT is calculated by comparing the outcome rates in two groups: the treatment group and the control group. The difference in the outcome rates between the two groups is then used to determine the NNT. A lower NNT indicates a more effective treatment, as fewer patients need to be treated to achieve the desired outcome.
Let's assume the following values:
Using the formula:
\[ ARR = 0.30 - 0.20 = 0.10 \]
\[ NNT = \frac{1}{0.10} = 10 \]
The Number Needed to Treat is 10.