Survival analysis, part 2: Kaplan-Meier method and the log-rank test

Koletsi, D; Pandis, Nikolaos (2017). Survival analysis, part 2: Kaplan-Meier method and the log-rank test. American journal of orthodontics and dentofacial orthopedics, 152(4), pp. 569-571. Elsevier 10.1016/j.ajodo.2017.07.008

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When analyzing survival data, time-to-event methods estimate the probability of not reaching the event, even though we are interested in reaching the event (ie, dental arch alignment). This occurs because these methods were developed for studies on death, where survival is the outcome of interest. The Kaplan-Meier method1 is often applied to estimate the probability of survival (not experiencing the outcome of interest—ie, dental arch alignment from our previous example2).

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