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In page ASA physical status classification system:

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In 1940–41, ASA asked a committee of three physicians (Meyer Saklad, Emery Rovenstine, and Ivan Taylor) to study, examine, experiment and devise a system for the collection and tabulation of statistical data in anesthesia which could be applicable under any circumstances.[1] This effort was the first by any medical specialty to stratify risk.[2] While their mission was to determine predictors for operative risk, they quickly dismissed this task as being impossible to devise.[citation needed]They state: