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. Author manuscript; available in PMC: 2018 Mar 1.
Published in final edited form as: Transfusion. 2016 Dec 1;57(3 Pt 2):823–831. doi: 10.1111/trf.13939

Figure 1.

Figure 1

Hypothetical donation patterns to illustrate differences among estimation methods in the donors and follow-up time included in incidence estimates. Solid line segments indicate follow-up time that is included in an estimate. Dashed line segments indicate follow-up time that is not included. Open symbols indicate uninfected donations, while solid symbols indicate infected donations. Vertical arrows indicate time of infection assumed in the incidence rate calculations for cases that are included in the estimates. An infected donor is included in the numerator of an incidence estimate only if at least part of the follow-up time for that donor is included in the denominator (e.g. donor 5 methods 1,2 vs donor 5 methods 3,4).