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. 2012 Jul 10;9(7):e1001250. doi: 10.1371/journal.pmed.1001250

Figure 2. Consequence of measuring HIV incidence over the whole trial duration.

Figure 2

Comparison of the instantaneous reduction in HIV incidence measured at one time point with the cumulative incidence rate ratio (IRR) measured over the whole trial duration (i.e., in a cohort that was initiated at the start of the trial) in a simulated population in Zimbabwe [16]. The grey dotted line shows the IRR if the full impact were achieved at the start of the intervention rather than after 10 y. The instantaneous IRR is 0.65 compared with only 0.77 for the cumulative IRR at year 10. From [16].