When the confidence intervals for HIV prevalence rates were not reported, they were calculated assuming a simple random sample, using Stata version 12 StataCorp LP, College Station, USA.
Cuando los intervalos de confianza de las prevalencias de VIH no estaban reportados, se calcularon asumiendo un muestreo aleatorio simple, utilizando el software estadístico Stata versión 12 StataCorp LP, College Station, EE.UU..