Table.

Summary of the data used in this analysis, their respective sources, and years extracted per country

	Data extracted	Years extracted	Date accessed
UN World Population Prospects 201915	Country-level estimates of total population and surviving infants for all 15 ECOWAS countries	2001–19	July 15, 2020
WHO/UNICEF Estimates of National Immunization Coverage database18	Country-level MCV1 and MCV2 coverage estimates for all 15 ECOWAS countries	2001–19	July 15, 2020
WHO measles surveillance database21	Absolute number of measles cases reported per country for all 15 ECOWAS countries	2001–19	July 15,2020
MICS19*	Country-level MCV1 coverage disaggregated by geographical areas	2014–18	July 18, 2020
DHS20*	Country-level MCV1 coverage disaggregated by geographical areas	2005–18	July 18, 2020
WHO Immunization Database22	Country-level supplementary immunisation activities for all 15 ECOWAS countries	2001–19	July 21, 2020
JEE mission reports23†	JEE scores per country	2016–19	July 21, 2020

DHS=Demographic and Health Survey. ECOWAS=Economic Community of West African States. JEE=Joint External Evaluation. MCV1=first dose of measles-containing vaccine. MCV2=second dose of measles-containing-vaccine. MICS=Multiple Indicator Cluster Survey.

^*Data from either the MICS or DHS were extracted depending on which survey was the most recent in the country: Benin (DHS 2017–18), Burkina Faso (DHS 2010), Cabo Verde (DHS 2005), Côte d'Ivoire (MICS 2016), The Gambia (MICS 2018), Ghana (DHS 2014), Guinea (DHS 2018), Guinea Bissau (MICS 2014), Liberia (DHS 2013), Mali (DHS 2018), Niger (DHS 2012), Nigeria (DHS 2018), Senegal (DHS 2017), Sierra Leone (MICS 2017), and Togo (DHS 2013–14).

^†2016=Côte d'Ivoire, Liberia, Senegal, and Sierra Leone. 2017=Benin, Burkina Faso, The Gambia, Ghana, Guinea, Mali, and Nigeria. 2018=Niger and Togo. 2019=Guinea Bissau.