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What is Attempts to quantitate clinical conditions on a graduated scale, thereby facilitating comparison among populations examined by the same criteria and methods is: and explain in detail?
"A numerical value describing the relative status of a population on a graduated scale with definite upper and lower limits, which is designed to permit and facilitate comparison with other populations classified by the same criteria and methods". - Russell A.L. 
"Epidemiologic indices are attempts to quantitate clinical conditions on a graduated scale, thereby facilitating comparison among populations examined by the same criteria and methods" - Irving Glickman.