Cohort

Definition and stakes

Portrait of Benjamin Rush Benjamin Rush,  Medical Inquiries and Observations…

“ III. I shall enumerate its peculiar diseases, and the remedies which are most proper to remove, or moderate them.
I. The circumstances which favour longevity, are,
1. Descent from long-lived ancestors. I have not found a single instance of a person, who has lived to be 80 years old, in whom this was not the case. In some instances I found the descent was only from one, but, in general, it was from both parents. The knowledge of this fact may serve, not only to assist in calculating what are called the chances of lives, but it may be made useful to a physician.
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Source: Gutenberg

Portrait of Thomas Jefferson Thomas Jefferson,  The Memoirs, Correspondence, and Miscellanies…

“ The period of a generation, or the term of its life, is determined by the laws of mortality, which, varying a little only in different climates, offer a general average, to be found by observation. I turn, for instance, to Buffon’s tables, of twenty-three thousand nine hundred and ninety-four deaths, and the ages at which they happened, and I find that of the numbers of all ages living at one moment, half will be dead in twenty-four years and eight months. ”
Source: Gutenberg

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