Severity of the disease was evaluated in terms of ICU admission, length of hospital stay, final grade as per Atlanta 2012 classification and presence of pancreatic necrosis. Data were collected prospectively in a Microsoft Excel Database. After completion of data collection, the database was imported into SPSS for Mac (v24.0, SPSS, Chicago, IL, USA). Continuous based line descriptive variables were expressed as mean with standard deviation and were compared using the Mann-Whitney Test and univariate ANNOVA test. Categorical variables were expressed as absolute numbers and proportions. Bivariate relationships for categorical variables were assessed using Fischer’s exact test and Pearson’s chi square test. Sensitivity, specificity, positive predictive value and negative predictive value were calculated for each scoring system. Receiver operating characteristics (ROC) curves for severe acute pancreatitis, ICU admission, pancreatic necrosis and organ failure were plotted for Ranson’s score, BISAP, APACHE II and modified CTSI, and predictive accuracy of each scoring system was measured by the area under ROC curve (AUC) with 95% confidence interval. AUC values were compared for statistical significance using De Long test. A p-value of <0.05 was considered statistically significant.