Use of demographic tools in the assessment of the health level of populations

摘要: The increase in the length of life, resulting from a drop mortality, gives rise to questions on its limits and consequences. Life expectancy is at heart research developed answer these questions; it allows summarize, within single synthetic value, conditions mortality prevailing time study. expectancy, as period indicator, provides average number years that one, certain age, could expect live under current mortality. Repeated calculation such indicators possibility assess evolution conditions. Thus life testifies, quantitatively, improvement by accounting for gained.