BISAP score | Derivation cohort, n = 17 922 | Validation cohort, n = 18 256 | ||
Number of cases | Observed mortality | Number of cases | Observed mortality | |
0 | 5121 | 0.2% | 4912 | 0.1% |
I | 7206 | 0.7% | 7722 | 0.5% |
2 | 3829 | 2.1% | 3941 | 1.9% |
3 | 1390 | 8.3% | 1349 | 5.3% |
4 | 331 | 19.3% | 292 | 12.7% |
5 | 45 | 26.7% | 40 | 22.5% |
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.