CRP and alkaline phosphatase measurement: The univariate analysis revealed that age (OR:1.012, 95% CI, 1.001–1.024, p = 0.003), female gender (OR:0.508, 95% CI, 0.303–0.852, p = 0.01), WBC (OR:1.232, 95% CI, 0.02–0.27, p = 0.023), hematocrit (OR:1.095, 95% CI, 1.043–1.149, p = 0.033), BUN (OR:1.058, 95% CI, 1.038–1.078, p < 0.001), CRP (OR:1.006, 95% CI, 1.003–1.010, p < 0.001), NLR (OR:1.178, 95% CI, 1.126–1.232, p < 0.001), and NCI (OR:1.041, 95% CI, 1.131–1.257, p < 0.001) were associated with severe AP.