Table 1.

Calculation of weighted estimates of catchment area-level MTCT and HIV-free infant survival at 9–18 months, by survey round; five provinces in Zimbabwe, 2012–14

# Outcome indicator	Survey Round	n	CA-level Mean	SD	Min	Median	Max
(1) Number of HIV-exposed infants per CA	2012	132	6.54	4.94	0	5	32
	2014	132	8.64	6.83	0	7	41
(2) Number of HIV-exposed infants who were HIV-infected per CA	2012	132	0.58	0.76	0	0	3
	2014	132	0.49	0.94	0	0	5
(3) Number of HIV-exposed infants who were alive & HIV-uninfected per CA	2012	132	5.96	4.75	0	5	29
	2014	132	8.15	6.28	0	7	38
(4) MTCT at 9–18 months* = (2)/(1)	2012	128	10.03	14.50	0	0	66.7
	2014	130	4.83	8.55	0	0	50
(5) HIV-free infant survival at 9–18 months = (3)/(1)	2012	128	89.60	14.47	33.3	100	100
	2014	130	95.12	8.59	50	100	100

MTCT = mother-to-child transmission of HIV; SD = standard deviation; Min = minimum value; Max = maximum value

^*No MTCT rate was calculated for the catchment areas with 0 HIV-exposed infants (4 catchment areas at baseline, 2 catchment areas at endline).