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Table 1 Expected values for the observed infected proportion I(T), and person years at risk (PYAR) in a clinical trial with follow-up period T, of a vaccine with individual efficacy VE, in a region with force of infection Λ.

From: Heterogeneity in malaria exposure and vaccine response: implications for the interpretation of vaccine efficacy trials

Group Proportion infected I(T) Person years at risk PYAR
Control 1 - eT
Vaccine 1 - e-(1 - VET