Trial risk translator
Compare absolute and relative effects using cumulative rates for the same unwanted event and follow-up period, without treating a trial result as personal risk.
How to read the result
The absolute difference is the control percentage minus the treatment percentage. The risk ratio divides treatment by control; relative reduction is one minus that ratio.
For unequal unwanted-event rates, 100 divided by the absolute percentage-point difference gives the number needed, rounded upward. NNTB labels an additional beneficial outcome; NNTH labels an additional harmful outcome. The comparison and follow-up period remain essential.
This worksheet does not calculate confidence intervals, account for competing risks, translate hazard ratios or predict an individual outcome. Rounded rates may produce a different number than a publication’s underlying data.