Female population is the percentage of the population that is female. Population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship. Development relevance: Females comprise almost one-half of the world population. Female population relative to male population is a primary demographic indicator, reflecting historical events such as wars and the socio-demographic and ethno-cultural characteristics of the population. Statistical concept and methodology: Population structure by age and sex in the World Bank's estimates is based on the population structure by age and sex in United Nations Population Division's World Population Prospects. For more information, see the original source.