(4) Ranking among 71 developing countries with available data only. Countries in the sample surveyed between 1990-2005. Refers to population below income poverty line as define by the World Bank's $2 per day indicator
(5) Because the Gini coefficient used for the ranking corresponds to different years depending on the country, and the underlying household surveys differ in method and in the type of data collected, the distribution data are not strictly comparable across countries. The ranking therefore is only a proxy for reference purposes.
(6) The Human Opportunity Index study was performed by the World Bank among 19 countries in the Latin American and the Caribbean region, where statistics and census information is most reliable. Therefore, it is a regional index and there is no worldwide ranking available.
(7) The Life Satisfaction Index study was performed by the Inter-American Development Bank among 24 countries in the Latin American and the Caribbean region, based on IDB calculations based on Gallup World Poll 2006 - 2007 and World Development Indicators. Therefore, it is a regional index.
^Yale Center for Environmental Law & Policy / Center for International Earth Science Information Network at Columbia University. "2010 Environmental Performance Index". Archived from the original on 2010-02-04. Retrieved 2010-01-27. ((cite web)): |author= has generic name (help)
^The Economist Intelligence Unit et al. (Vision of Humanity website). "Global Peace Index 2010". Archived from the original on 2010-06-01. Retrieved 2011-03-21.