![]() Life expectancy is determined by multiplying the sequence of the probabilities of survival at each age to determine the proportion of a population expected to survive to age x. To calculate life expectancy at age x ( e x), age-specific mortality and population counts are needed to determine the age-specific mortality rates (i.e., the q x) and survival probabilities ( l x) used in life table computations. The age most often selected to make comparisons is 0.0 (i.e., birth), although, for many substantive and policy analyses, other ages such as 65+ and 85+ are more relevant and may be used (e.g., for determining person-years of Medicare and Social Security benefit entitlement). It is the life table parameter most commonly used to compare the survival experience of populations. Life expectancy is the average number of years a person in a population could expect to live after age x. Manton, in Encyclopedia of Gerontology (Second Edition), 2007 Introduction Whereas statins take about 2 years to yield likely survival benefits for CHD, they can reduce claudication more rapidly. This approach is also limited by the fact that many therapies have multiple effects. Therapies providing symptom improvement can be useful even if longevity is limited (e.g., balloon aortic valvuloplasty), whereas those that primarily prolong survival times (e.g., statin therapy) might only have value for those with significant life expectancy. It is important to clarify which therapies are likely to relieve symptoms and which may extend life. These decisions must be informed by awareness of each therapy's anticipated lag time to benefit as well as any potential lag time to harm. 198 CVD therapies may then be considered in relation to the predicted longevity, with the intention of only using therapies when there is sufficient longevity for a meaningful effect. Convenient tools to approximate the length of life have been developed and validated. Zipes MD, in Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 2019 Life ExpectancyĪnticipated life expectancy is sometimes used to gauge the utility of care for older patients. ![]()
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