PSI class and mortality in the Pneumonia PORT validation cohort

Class	Points	Mortality (percent)
I	No predictors	0.1
II	≤70	0.6
III	71 to 90	0.9
IV	91 to 130	9.3
V	>130	27.0

PSI: Pneumonia Severity Index; PORT: Patient Outcomes Research Team.

Data from: Fine MJ, Auble TE, Yealy DM. A prediction rule to identify low-risk patients with community-acquired pneumonia. N Engl J Med 1997; 336:243.

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