Mean recency duration for seroconverting postpartum women in the ZVITAMBO Trial, estimated using non-linear mixed modeling (NLMM), as a function of the minimum number of samples (NS) allowable per client and the maximum period (<i>t₀</i>) allowed between the last negative, and first positive, HIV tests; <i>n</i> denotes the resulting number of clients included in the test.

<p>The optical density cut-off was fixed at 0.8 for all estimates. The coefficient of variation (CoV) is defined as the standard error of the estimate divided by the mean, expressed as a percentage.