==See also==* Number needed to harm – the converse for side-effects==References====External links==*EBEM's Calculator for NNT*Online Calculator for NNT (GraphPad Software)*Centre for Evidence Based Medicine: EBM Tools: Critical Appraisal: NNT*Table of NNTs for various treatments*NNT calculator by The Garvan Institute of Medical Research
* EBEM’s Calculator for NNT* Online Calculator for NNT (GraphPad Software)* Centre for Evidence Based Medicine: EBM Tools: Critical Appraisal: NNT* Table of NNTs for various treatments