Pneumonia Severity Index - PSI Derivation and Validation Data

PSI Derivation and Validation Data

Medisgroup Study (1989) PORT Validation Study (1991) Cohort
Derivation Cohort Validation Cohort Inpatients Outpatients All Patients
Risk Class no. of pts % died no. of pts % died no. of pts % died no. of pts % died no. of pts % died
I 1,372 0.4 3,034 0.1 185 0.5 587 0.0 772 0.1
II (<70) 2,412 0.7 5,778 0.6 233 0.9 244 0.4 477 0.6
III (71–90) 2,632 2.8 6,790 2.8 254 1.2 72 0.0 326 0.9
IV (91–130) 4,697 8.5 13,104 8.2 446 9.0 40 12.5 486 9.3
V (>130) 3,086 31.1 9,333 29.2 225 27.1 1 0.0 226 27.0
Total 14,199 10.2 38,039 10.6 1343 8.0 944 0.6 2287 5.2

Note: % Died refers to 30-day mortality.

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