Glossary of Terms for Evidence-Based Orthopaedics

The following terms are commonly used in abstracts describing trials of therapeutic interventions.

EER is the experimental (new treatment) event rate.

CER is the control (old treatment or nontreatment) event rate.

CI (confidence interval) quantifies the uncertainty in measurement. CI is usually reported as a 95% CI, which is the range of values within which we can be 95% sure that the true value for the whole population lies.

When the experimental treatment reduces the risk for a bad event:

ARR (absolute risk reduction) is the absolute arithmetic difference in …

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