Abstract
The study investigated the factors responsible for compression of mortality usually observed in human survival curves. The concept of rectangularisation was adopted to study the changes that occur in human survival curves at the older ages under the assumption that the basic mortality table is occurring in time zero. Simulations were carried out to examine the behavior of survival and cumulative death curves under varying conditions. The result revealed that the survival curve shifts to the right of the base mortality survival curve l୶ as mortality situation improves. Furthermore, the study indicated that expansion of mortality spectrum will occur if mortality curve is allowed to flow smoothly throughout the human life.
Highlights
With the fall of man from grace to grass, he has been exposed to hardship, diseases, hunger, pains, sorrows which will eventually culminate into death if not properly handled.death remains the biggest challenge to man not by coincidence but by divine design
The inter-quartile range began to drop with further improvement in the mortality rate and continued down wards as long as the restriction on the terminal age is maintained
A close look at table 1 above shows that the interquatile ranges increased gradually from 19.80 for the base table to 33.4 for 25% reduction in the number of death at all ages
Summary
With the fall of man from grace to grass, he has been exposed to hardship, diseases, hunger, pains, sorrows which will eventually culminate into death if not properly handled. Death remains inevitable, man appears to be wining the battle up to some extent Some of these causes that shortened the life span of man are gradually being eliminated by scientific discoveries and advancement in medical science. Two important demographic consequences of improved human mortality are increased life expectancy and aging of the population. Expectation of life at birth as one of the parameters of measuring the improvement in human mortality is the average age at death in a stationary population. The study attempts to examine the changes in the variability of the distribution of the ages at death due to mortality improvement. Mortality improvement in any human population would always manifest as reduction in the number of deaths in some age brackets. Simulations were carried out to examine the behaviour of the survival and cumulative death curves under varying conditions
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