CAP PIRO Score

0–2 points = Low risk (1 in 30) for ICU mortality
3 points = Mild risk (1 in 8) for ICU mortality
4 points = High risk (2 in 5) for ICU mortality
5–8 points = Very high risk (3 in 4) for ICU mortality

References:
Rello J. Crit Care. 2008;12 Suppl 6:S2. -> PubMed