relative risk (RR)

Syn.: risk ratio. The ratio (quotient) of the risk that an event will occur among the subjects exposed to a given factor and the risk that this event will occur among the subjects not exposed to this factor. Note: A relative risk (RR) of 1 indicates that the risk is equal in the groups compared, an RR > 1 indicates that the factor increases the risk, and an RR < 1 indicates that the factor decreases the risk.


and • provides information on costs and financial impact. Note 2: The report may optionally discuss organisational considerations. Note 3: A “mini-HTA” may be as rigorous as an HTA report but typically has a restricted scope and so is quicker to produce. Note 4: Related terms include health technology, HTA report, rapid review, level of evidence