Predicted number of children aged 1–4 y with anaemia in Burkina Faso, Ghana, and Mali in 2011.

aSource: based on a 2.5 arc-minute resolution Gridded Population of the World (GPWv3) map for 2009.bSource: World Population Prospects 2008 Revision Population Database (Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat; http://esa.un.org/unpp).cThe estimates provided by the World Population Prospects database are for children aged 0–4.99 y. To obtain estimates of the percentage of children aged 1–4 y (the age group included in our analysis), the estimates presented by the World Population Prospects database were discounted by a factor of 0.2.