ALB and systemic inflammatory response syndrome: When using these potential predictors (except albumin) as categories, all remained independently associated with SAP in multivariate logistic regression analysis: SIRS (odds ratios (OR) 2.98; 95% confidence interval (CI) 1.47–6.04; P = 0.003), hematocrit (OR 2.24; 95% CI 1.13–4.46; P = 0.021), albumin (OR 0.51; 95% CI 0.36–0.73; P < 0.001), AST (OR 2.18; 95% CI 1.13–4.19; P = 0.02), serum glucose (OR 2.27; 95% CI 1.12–4.61; P = 0.023), BUN (OR 4.58; 95% CI 2.16–9.70; P < 0.001) and pleural effusion (OR 4.68; 95% CI 2.42–9.05; P < 0.001).