A measure of mortality based on life expectancies

"Two alternative measures of mortality have been proposed in this paper. These are (a) the average age of the stationary population, and (b) the area covered by the life expectancy function. The former has been shown to be equal to the average number of years remaining to be lived by the stationary population and as such can be used as a measure of mortality.... The usefulness of the latter is also obvious, based as it is on the values of the life expectancies at all ages instead of that at birth alone." The measures are estimated for seven selected countries.