## What is the meaning of NNT?

Number Needed to Treat

The Number Needed to Treat (NNT) is **the number of patients you need to treat to prevent one additional bad outcome** (death, stroke, etc.). For example, if a drug has an NNT of 5, it means you have to treat 5 people with the drug to prevent one additional bad outcome.

## What is a normal NNT?

As a general rule of thumb, an NNT of **5 or under** for treating a symptomatic condition is usually considered to be acceptable and in some cases even NNTs below 10. Below are some NNTs for routine medical interventions.

## What is NNT used for?

It is a simple statistical concept called the “Number-Needed-to-Treat”, or for short the ‘NNT’. The NNT **offers a measurement of the impact of a medicine or therapy by estimating the number of patients that need to be treated in order to have an impact on one person**.

## How do I get NNT?

NNTs are always rounded up to the nearest whole number and accompanied as standard by the 95% confidence interval . Example: if a drug reduces the risk of a bad outcome from 50% to 40%, the ARR = 0.5 – 0.4 = 0.1. Therefore, the **NNT = 1/ARR = 10**.

## What does an NNT of 10 mean?

The number needed to treat (NNT) is the number of patients that are needed to treat to prevent 1 additional adverse outcome (e.g., stroke, death). For example, if a drug has an NNT of 10, it means **10 people must be treated with the drug to prevent 1 additional adverse outcome**.