number needed to screen
— The number of people who would need to be screened over a specific period of time before one good outcome of the screening will occur
The number needed to screen is an estimate of how many people need to be screened before one person would experience a good outcome.
For example, if a study found that for every 1000 participants allocated to screening for cancer there was one less death from that cancer over a period of ten years compared to every 1000 people allocated to not receive the screening test, the number needed to screen would be 1000, for ten years.
number needed to treat · screening
Still don't get it?
If you feel that this definition hasn't helped you to understand the term, click on our monkey to let us know.
← number needed to harm
number needed to treat →