Validation of PMI-based nomogram
The nomogram outperformed the MELD and MELD-Na scores in the training group, having significantly higher AUROCs [0.812 (95% CI 0.747–0.866), 0.702 (95% CI 0.630–0.768), and 0.727 (95% CI 0.656–0.790), respectively, both P < 0.05], demonstrating superior discriminatory capacity (Fig. Area under the receiver operating characteristic curve (AUROC) for nomogram, MELD and MELD-Na scores in the training set (The calibration curve of nomogram. (The decision curves of the nomogram, MELD and MELD-Na scores in the training set (