This dataset compromises all country data included in the UN Inter-agency Group for Child Mortality Estimation (IGME) database (https://childmortality.org/data, downloaded June 2019). It includes: Reference area: name of the country Indicator: child mortality indicator (neonatal mortality, infant mortality, under-5 mortality and mortality rate age 5 to 14) Sex: sex of the child (male, female and total) Series name: name of survey/census/VR [note: UN IGME estimates, i.e. not source data, are identified as "UN IGME estimate" in this field] Series year: year of survey/census/VR series Observation value: value of indicator from survey/census/VR Observation status: indicates whether the data point is included or excluded for estimation [status of "normal" indicates UN IGME estimate, i.e. not source data] Series Category: category of survey/census/VR, and can be: DHS [Demographic and Health Survey] MIS [Malaria Indicator Survey] AIS [AIDS Indicator Survey] Interim DHS Special DHS NDHS [National DHS] WFS [World Fertility Survey] MICS [Multiple Indicator Cluster Survey] NMICS [National MICS] RHS [Reproductive Health Survey] PAP [Pan Arab Project for Child or Pan Arab Project for Family Health or Gulf Famly Health Survey] LSMS [Living Standard Measurement Survey] Panel [Dual record, multiround/follow-up survey and longitudinal/panel survey] Census VR [Vital Registration] SVR [Sample Vital Registration] Others [e.g. Life Tables] Series type: the type of calculation method used to derive the indicator value (direct, indirect, household deaths, life table and vital records) Standard error: sampling standard error of the observation value Series method: data collection method, and can be: Survey/census with Full Birth Histories Survey/census with Summary Birth Histories Survey/census with Household death Vital Registration Other Lower and upper bound: the lower and upper bounds of 90% uncertainty interval of UN IGME estimates (for estimates only, i.e., not source data). The dataset is used in the following paper: Ezbakhe, F. and Pérez-Foguet, A. (2019) Levels and trends in child mortality: a compositional approach. Demographic Research (Under Review)