![]() ![]() (2015) 2 compiles data from various sources: the OECD.Stat database library, the United Nations World Population Prospects Database (UN WPP), the Human Mortality Database (HMD), the Montevideo-Oxford Latin American Economic History Database (MOxLAD), and Gapminder. Less historical data is available from the pre-health transition period in countries – this is especially the case for Africa, Asia, Oceania, and the former Soviet Union. Riley (2005) 3 compiles life expectancy estimates from hundreds of historical sources and calculates the average of estimates that met an acceptable quality threshold, such as having estimates for entire nations or regions.For pre-1950 data on world regions and the world as a whole, we use estimates from Riley (2005). For data points before 1950, we use Human Mortality Database data 4 combined with Zijdeman (2015). This data is compiled from three sources: the United Nations’ World Population Prospects (UN WPP), Zijdeman et al.For a given year, it represents the average lifespan for a hypothetical group of people, if they experienced the same age-specific death rates throughout their whole lives as the age-specific death rates seen in that particular year.Period life expectancy is a metric that summarizes death rates across all age groups in one particular year.
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