<P> These were measured during the first 24 hours after admission, and utilized in addition to information about previous health status (recent surgery, history of severe organ insufficiency, immunocompromised state) and baseline demographics such as age . The calculation method is optimized for paper schemas, by using integer values and reducing the number of options so that data fits on a single - sheet paper form . </P> <P> The score is not recalculated during the stay; it is by definition an admission score . If a patient is discharged from the ICU and readmitted, a new APACHE II score is calculated . </P> <P> In the original research paper that described the APACHE II score (see references), patient prognosis (specifically, predicted mortality) was computed based on the patient's APACHE II score in combination with the principal diagnosis at admission . </P> <P> A method to compute a refined score known as APACHE III was published in 1991 . </P>

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