Scores attributed to the selected variables regarding each of the four components of PIRO.

P score – Predisposition score, I score – Insult/Infection score, R score – Host Response score, O score – Organ dysfunction score, ATB – antibiotic therapy, CAI – community-acquired infection, HCAI – healthcare-associated infection, HAI – hospital acquired infection, SOFA – Sepsis-related Organ Failure Assessment.