Calculating NNT

Although the calculated NNT value is treatment specific it can be used to compare different drug treatments.

In a randomised control trial for Noache, 88 out of 100 still experienced a headache 2 hours after taking the placebo, whereas only 78 out of 100 still experienced a headache in the group taking Noache.

Work through the following example to see how we can compare the results that we calculated for Headeeze with those for the established headache treatment Noache.

Complete the table by entering the ARR and NNT for Noache. Click 'Submit' to check your answer.
Benefits Placebo Noache ARR (%) NNT
Event rate 88% 78%