Data quality of reported child immunization coverage in 194 countries between 2000 and 2019
Fig 2
Modeled probability of data quality flags for immunization coverage reports for DTP1, DTP3, MCV1, and BCG worldwide and by different country classifications, 194 WHO Member States, 2000–2019.
Notes: Error bars represent 95% confidence intervals (CI). Country data as reported by 15 July 2020. BCG = Bacillus Calmette-Guérin vaccine birth dose. DTP1 = first dose of diphtheria-tetanus-pertussis-containing vaccine. DTP3 = third dose of diphtheria-tetanus-pertussis-containing vaccine. FCS = fragile and conflict-affected situations. MCV1 = first dose of measles-containing vaccine. Countries were grouped separately for each year by World Bank income groups, population size, and fragile and conflict-affected situations (FCS) classification. All other groupings were done for all years together. FCS status was available for 2004–2019 only. Immunization coverage level was based on average DTP1 and DTP3 coverage estimated by WHO and UNICEF for 2017–2019, as of July 2020. Birth registration levels refer to children under age five who have been registered based on the latest available UNICEF estimate. Support by Gavi, the Vaccine Alliance, refers to funding in any year between 2000–2019. See S1 Appendix for detailed lists of countries.