Journal of general internal medicine
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Randomized Controlled Trial Multicenter Study Comparative Study Clinical Trial
Validation of the pneumonia severity index. Importance of study-specific recalibration.
To evaluate the predictive validity and calibration of the pneumonia severity-of-illness index (PSI) in patients with community-acquired pneumonia (CAP). ⋯ We found that the PSI had good discriminatory ability. The original PSI overestimated absolute risk of death in our population. We describe a simple approach to recalibration, which corrected the overestimation in our population. Recalibration may be needed when transporting this prediction rule across populations.