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. 2015 Apr 8;10(4):e0124314. doi: 10.1371/journal.pone.0124314

Fig 2. Schematic Illustration for the Actual Method Calculating the Incidence Rate of Events for Each APT status.

Fig 2

As an example, this figure illustrates how to calculate the incidence rate of stent thrombosis under dual-APT during the interval of 731–1095 days after index SES implantation. For the calculation of incident rate, the numerator is the number of events in patients on dual-APT just 1-day before the event, and the denominator is the total person-days on dual-APT, which is censored after event and expressed as trapezoidal area in the graph. Incidence rate was presented in 100 person-years units. APT = antiplatelet therapy, DAPT = dual-APT, PCI = percutaneous coronary intervention, SES = sirolimus-eluting stents, and ST = stent thrombosis.