The real reasons not to rely on severity scores.
Cohen
Neal H
NH
D018806:APACHE; D001530:Belgium; D002986:Clinical Trials as Topic; D003422:Critical Care / Q000379:methods*; D016638:Critical Illness / Q000401:mortality / Q000628:therapy; D003661:Decision Support Techniques; D005260:Female; D006801:Humans; D007362:Intensive Care Units; D008297:Male; D018579:Patient Selection; D011237:Predictive Value of Tests; D018570:Risk Assessment; D012720:Severity of Illness Index