Estimated related risk of death
The Relative Risk (RR) is the ratio of the risk of disease among people with a risk factor to those without. It indicates the strength of a risk disease (or death), or causal factor. This is synonymous with risk ratio.
- An RR of 1.0 means that the two incidence rates (disease among those with, and those without, the risk factor) are equal, so the factor has no effect.
- An RR of 2.0 would indicate that the exposed people were twice as likely to get the disease
- Conversely an RR of 0.5 means they were half as likely, so the exposure protected them from disease.