Evidence-appraisal glossary
Crude rate
A crude rate is the overall rate of an outcome in a population, calculated without adjusting for the population's composition such as its age or sex mix. It reflects the true burden actually experienced but can be misleading when comparing populations that differ in structure.
Also called: unadjusted rate.
The crude rate answers a real question about how common an event is in a given population, which makes it useful for planning services and counting actual cases. Its weakness appears in comparisons: a region with more older residents may show a higher crude death rate than a younger region even if people of the same age are equally healthy, because age composition confounds the comparison. This is why crude and age-standardized rates are usually reported together, one describing the real burden and the other enabling fair comparison.
Read the full Reading the Evidence blog.
This is a plain-language methodology definition for reading research. It is general education, not medical advice.