The Gender Inequality Index relies on data from major publicly available databases, including the maternal mortality ratio from UNICEF’s The State of the World’s Children; adolescent fertility rates from the UN Department of Economic and Social Affair’s World Population Prospects; educational attainment statistics from the UNESCO Institute for Statistics educational attainment tables and the Barro-Lee data sets; parliamentary representation from the International Parliamentary Union; and labour market participation from the International Labour Organization’s LABORSTA database.