Figure 1From: A set of indicators for decomposing the secular increase of life expectancy Example of survival curve with rectangularity index R and longevity index t Q . These indexes are calculated from the conditional survival curve S(t) for those people reaching the age of t 0, such that S(t 0 ) = 1 and S(t Q ) = 1 - Q. On that example, t 0 = 50, Q = 0.9, R = 0.66 and t Q = 92.Back to article page