Civil registration and vital statistics (CRVS) systems register births and deaths in a country, issue birth and death certificates, and compile and disseminate vital statistics.
Well-functioning CRVS Systems use inputs into and exits from a population register to provide governments with critical information on their population by age, sex, location, occupation and other variables on which to develop policies
and plan services. The completeness (i.e. the percentage of all births/deaths registered), data accuracy and the timeliness of civil registration are essential for quality vital statistics.
The completeness percentages are statistical estimates based on available data. These estimates are produced using data from two sources: the UN Demographic Yearbook and UNICEF's State of the World's Children estimates.