Abstract
In orthodontics and dentistry in general, we are frequently working on studies where groups of patients are followed over time with the aim to record the occurrence of an event. Subjects may enter a study at various times and be followed until (1) the event of interest occurs, (2) the study is completed (end of follow-up time), or (3) they are lost to follow-up. The analysis of this kind of study is based on incidence rates, or more simply, rates (λ). Rate is the total number of events per person per unit of time (ie, person-time) and reflects the probability that a subject will experience the event of interest at a prespecified time.
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Schedule a callMore From: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics
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