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The pneumonia severity index (PSI) is also known as the PORT score, PORT being a subset of the validation cohort. It was derived based on data from 14,199 adult patients and subsequently validated on over 40,000 patients in the United States and Canada. HIV-positive patients and those with a recent admission for pneumonia were excluded. A simpler score, known as the CURB-65 score, has also been prospectively validated. A comparison between these two scoring systems demonstrated a slightly better performance using the PSI compared to the CURB-65 score, however the clinical utility of this difference is likely small.
References
Fine MJ et al. A prediction rule to identify low-risk patients with community-acquired pneumonia. NEJM 1997;336:243.
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Lim WS et al. Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study. Thorax 2003;58:377.
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Aujesky D et al. Prospective comparison of three validated prediction rules for prognosis in community-acquired pneumonia. Am J Med 2005;118:384.
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