HIV incidence stratified by duration of time in study follow up, and (where data were available) by study year.

<p><sup>*</sup> Comparing HIV incidence in the first three months to HIV incidence in subsequent months of follow up and HIV incidence in the first set of calendar years indicated to the subsequent set of years, where data were available</p><p><sup>**</sup> First return visit for this cohort was at six months post enrollment</p><p>HIV incidence stratified by duration of time in study follow up, and (where data were available) by study year.</p>