Figure 2

The ROC curve of SAAG. The area under the curve was 0.987, and the SAAG cut-off value 12.50 g/L was the best threshold to predict PHT ascites with a sensitivity of 99.20%, a specificity of 95.10% and an accuracy of 97.65%. The accuracy and specificity using SAAG 12.50 g/L were significantly higher than those using SAAG 11 g/L (accuracy, 97.65% vs 94.37%,P<0.01; specificity, 95.10% vs 85.19%, P<0.01).