Relative risk reduction and absolute risk reductionBMJ 2009; 339 doi: https://doi.org/10.1136/bmj.b3626 (Published 16 September 2009) Cite this as: BMJ 2009;339:b3626
- Siva K Talluri, clinical assistant professor
- 1Mclaren Regional Medical Center, Flint, MI 48532, USA
In a trial comparing a drug with a placebo for the prevention of stroke, the incidence of stroke at 1 year was 3% in the group receiving drug A (treatment group) and 4% in the group receiving placebo (control group); P=0.01.
What is the reduction in incidence of stroke in patients treated with drug A compared with those on placebo, and what is the difference in incidence between the …