How to use
- Enter the control and experimental event rates as percentages.
- Choose whether the event is harmful or beneficial.
- Read the absolute effect, relative effect, and people-needed metric together.
Wave 10 evidence bridge
Absolute effect and people needed
The share URL stores only outcome direction and decimal places.
How to read this page
This page is for absolute and relative effect interpretation. If you are still on the diagnostic-probability side, continue from Bayes theorem or pre/post-test probability first.
FAQ
What does this page calculate?
It calculates absolute risk reduction, relative risk reduction, relative risk, and the number needed to treat or harm from control and experimental event rates.
When does the page show NNH instead of NNT?
If the experimental rate moves in the harmful direction, the page interprets the effect as harm and the people-needed metric becomes the number needed to harm.
Does this page estimate confidence intervals?
No. This first release focuses on point estimates only, so you can compare ARR, RRR, and NNT/NNH quickly.
Does the share URL include my rates?
No. The share URL stores only light settings such as outcome direction and decimal places. The rates stay in your browser.