How to use
- Enter event and non-event counts for group A and group B.
- Choose the confidence level and decimal places.
- Read the risk ratio, interval, and warnings before moving to RR vs OR or risk-difference pages.
Wave 30 statistics entry
Add interval context to one risk ratio
The share URL stores only confidence and decimal settings.
How to choose between nearby pages
Use risk ratio from table when the point estimate and the signed gap are enough. Use this page when the same 2x2 table now needs interval context. Move to odds ratio confidence interval if the reporting frame is odds rather than risk.
FAQ
What does this page calculate?
It reads the risk ratio from one 2x2 table and adds a confidence interval at 90%, 95%, or 99%.
How is this different from the quick risk ratio page?
The quick risk ratio page is the shortest route to the point estimate plus the raw risk difference. This page keeps the same 2x2 input but adds confidence-interval context.
How is this different from the odds ratio confidence interval page?
This page stays in risk language and risk ratio. The odds-ratio confidence interval page uses odds language and is better when the reporting frame is OR rather than RR.
Does a zero cell break the interval?
No. When a cell is zero, the interval uses the standard 0.5 continuity correction so the interval can still be displayed.
Does the share URL include my counts?
No. The share URL stores only light settings such as decimal places and confidence level. Your counts stay in your browser.