Stratified Kaplan-Meier estimates of HIV-transmission rates among live-born singletons and first-born infants.

Data are numbers of singleton or first-born (in a multiple birth) infants initially at risk in each stratification category, Kaplan-Meier estimates of HIV-transmission rates (%) with 95% CIs at selected time points, p-values for the log-rank test, and, for stratification variables with two levels, two-sided p-values for the test of difference at 24 mo.