UN IGME 2015. The Inter-agency Group for Child Mortality of Estimation, which includes representatives from UNICEF, WHO, the World Bank and the United Nations Population Division, produces trends of neonatal mortality with standardized methodology by group of countries depending on the type and quality of source of data available. These neonatal rates are estimates, derived from the estimated UN IGME neonatal rate and infant population from World Population Prospects to calculate the live births; hence they are not necessarily the same as the official national statistics.