Longevity Advances in High-Income Countries, 1955–96



The advance of life expectancy within high-income countries from 1955 to 1996 is well represented by a straight-line trend. This explains more of the variance on average, and in 19 of 21 high-income countries, than logged or unlogged age-standardized death rates. Change in life expectancy in individual countries over this period was partially predicted by a country's level relative to the rest of this group of high-income countries and partially by a country's own prior rate of advance, with substantial convergence toward the group mean for both measures.