Figure 4. ROC curves for APRI, FIB-4, and AST/ALT ratio for predicting mild fibrosis. APRI has the best AUC, followed by FIB-4. AST/ALT: alanine aminotransferase/aspartate aminotransferase, APRI: AST-to-platelet ratio, FIB-4: fibrosis score, AUC: area under the ROC curve.