Total population - estimates from the CIA World Factbook. Estimates from July, 2015.
*CIA notes: estimates for these countries "explicitly take into account the effects of excess mortality due to AIDS; this can result in lower life expectancy, higher infant mortality, higher death rates, lower population growth rates, and changes in the distribution of population by age and sex than would otherwise be expected."
Life expectancy - estimates from the World Health Organization's publication World Health Statistics 2016. Estimates represent life expectancy at birth.
*WHO notes: data from "World Population Prospects, the 2015 revision (WPP2015). New York (NY): United Nations DESA, Population Division."
Skilled health professionals per 10,000 population - estimates from the World Health Organization's publication World Health Statistics 2016.
*WHO notes: "Skilled health professionals refer to the latest available values (2005–2013) in the WHO Global Health Workforce Statistics database aggregated across physicians and nurses/midwives.
Number of people living with HIV - refers to people of all ages, estimates as of 2014 by the World Health Organization's Global Health Observatory data repository.
*WHO notes: Definition - "The number of people with HIV infection, whether or not they have developed symptoms of AIDS, estimated to be alive at the end of a specific year. Method of estimation - "Countries produce national estimates of the number of people living with HIV, which are compiled and published annually by UNAIDS and WHO. Standard methods and tools for HIV estimates that are appropriate to the pattern of the HIV epidemic are used . However, to obtain the best possible estimates, judgement needs to be used as to the quality of the data and how representative it is of the population."
Percentage of population living in poverty - refers to percentage of population living below the poverty line. Estimates from 2012, from the CIA World Factbook.
*CIA notes: "National estimates of the percentage of the population falling below the poverty line are based on surveys of sub-groups, with the results weighted by the number of people in each group. Definitions of poverty vary considerably among nations. For example, rich nations generally employ more generous standards of poverty than poor nations."