Event Rate« Back to Glossary Index
Event rates have to do with the frequency of occurrence of an event in a population. Event rates take into account the possibility of an event occurring several times in an individual and are typically expressed as events per 100 person years or 1,000 person years. The term “event rate” is very frequently, but incorrectly, used to describe the frequency or risk of events when an event is counted only once in an individual. Most of the time when you see “control event rate” what is meant is “control group risk”; similarly when you see “experimental event rate” what is usual meant is the risk in the experimental group.