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Why are John Grauntās mortality tables important in the history of demography?
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John Graunt is widely recognized as the founder of demography because his 1662 work, Natural and Political Observations... Made upon the Bills of Mortality, pioneered the statistical analysis of human populations.12
His mortality tables are historically significant for several reasons:
- Innovation of the Life Table: Grauntās most celebrated contribution was the construction of the first life table. By using survivorship rates, he was able to predict the percentage of people living to successive ages and estimate life expectancy.12
- Statistical Regularity: He demonstrated that death and birth events were not random but followed predictable patterns, allowing him to estimate population sizes, the number of families, and the count of individuals of military or childbearing age.12
- Foundational Methodology: By analyzing parish records, he established the importance of vital statistics in understanding social phenomena, such as the observation that urban death rates exceeded rural ones and that male and female birth ratios were balanced by differential mortality.12
His work provided the essential framework for future demographic research and influenced later developments in public health and life insurance.12