The document compares estimates of HIV prevalence, caesarean section rates, and maternal health indicators between different data sources in multiple countries. For HIV prevalence in sub-Saharan Africa, estimates from antenatal clinic surveillance tend to be higher than household surveys nationally but more similar when limited to areas near clinics. Caesarean section rates from national surveys in developing countries also tend to be higher than rates reported in health facility records. Estimates of indicators like institutional births and caesarean sections in Peru from national health information systems understate rates compared to demographic and health surveys due to limited private health sector coverage in routine data.