The probability of death versus age for human populations of successively longer median life expectancy (expressed as deaths per 1000 population). Source: Department of Social Affairs. Population Branch, Age and Sex Patterns of Mortality: Model Life Tables for Underdeveloped Countries. Population Studies, No. 22, New York, United Nations, 1955.
Reichert et al. BMC Medicine 2012 10:162 doi:10.1186/1741-7015-10-162