... an epidemiological measure used in assessing the effectiveness of a health-care intervention, typically a treatment with medication. The NNT is the number of patients who need to be treated in order to prevent one additional bad outcome (i.e. the number of patients that need to be treated for one to benefit compared with a control in a clinical trial). It is defined as the inverse of the absolute risk reduction. It was described in 1988. The ideal NNT is 1, where everyone improves with treatment and no-one improves with control. The higher the NNT, the less effective is the treatmentThat being said, EVERY medication has a number needed to treat that is greater than one. So what are some common NNTs in medicine? The answer may surprise you.
Dr. Shaughnessy from Tufts Family Medicine pulled out a select few that I thought were notable.
A more extensive list can be found at Table of NNTs on Bandolier