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. 2015 Aug 6;10(8):e0134571. doi: 10.1371/journal.pone.0134571

Fig 2. Samples of mother-infant pairs used to calculate three estimates of HIV-free infant survival at 9–18 months, Zimbabwe, 2012.

Fig 2

The flowchart summarizes what samples were used to estimate HIV-free infant survival at 9–18 months. The overall estimate of HIV-free infant survival (‘estimate A’) was assessed among the ‘HIV-exposed infants’ sample (i.e., 1,081 pairs with HIV-infected mothers and infants either deceased or with available HIV status). The pre-Option A estimates of HIV-free infant survival (‘estimates B1 and B2’) were assessed among subsets of the ‘HIV-exposed infants’ sample, after excluding the infants who were exposed to Option A activities. We measured exposure to Option A activities in two ways: 1) according to the facility closest to the infant’s residence at the time of the survey, and 2) according to the facility where antenatal care (ANC) was received. These pre-Option A samples of infants were used to assess HIV-free infant survival using two definitions of exposure: ‘by residence’ (‘estimate B1’) and ‘by ANC facility’ (‘estimate B2’).