Table 2 Observed mortality by BISAP point score in the derivation and validation cohorts
BISAP scoreDerivation cohort, n = 17 922Validation cohort, n = 18 256
Number of casesObserved mortalityNumber of casesObserved mortality
051210.2%49120.1%
I72060.7%77220.5%
238292.1%39411.9%
313908.3%13495.3%
433119.3%29212.7%
54526.7%4022.5%
  • Overall χ2 p<0.001 for each study group. Within study group χ2 p<0.001 for differences in mortality between individual risk (score) categories in pairwise tests of significance.

  • BISAP, blood urea nitrogen, impaired mental status, systemic inflammatory response syndrome, age and pleural effusion.