CALCA and systemic inflammatory response syndrome: After adjustment for the covariates included in the model, CR (OR: 7.6, 95%CI: 4.1-13.7, p=0.0001), PCT (OR: 1.9, 95%CI: 1.1-3.4, p=0.003), WBC (OR: 2, 95%CI: 1-38, p=0.04), and SIRS (OR: 2.5, 95%CI: 1.3-4.8, p=0.005) were the main predictors of severity.