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The computed total score consists of integer values ranging from 0 to 71. The classification system consists of 11 physiology measures based on a numeric rating scale (0-4) where 0 reflects values within the normal range and an increase in the numeric rating scale represents an increase in the abnormality of the physiology measure in either the high or low direction. The final physiology measure, the Glasgow Coma Score (GCS), is reversed; so that lower scores indicate mild or no head injury and higher scores represent more severe head injury and range from (0-12). Chronological age is divided into disjoint categories and age groups and assigned values of (0, 2, 3, 5, 6). For patients with a history of severe organ system insufficiency or who are immunocompromised, a numeric rating of 2 or 5 is assigned for chronic health points, where 2 is assigned “for elective postoperative patients” and 5 is assigned “for nonoperative or emergency postoperative patients”.

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