GPT and pneumonia: After backward elimination and model selection based on AIC, age (hazard ratio [HR] = 0.49; 95%confidence interval [CI] = 0.29–0.83, p = 0.00734), pneumonia (HR = 0.31, 95%CI = 0.18–0.52, p = 1.73e − 05), ALT (HR = 0.49, 95%CI = 0.29–0.83, p = 0.00697), PF ratio (HR = 1.45, 95%CI = 1.21 − 1.97, p = 0.0413), and platelet count (HR = 1.77, 95%CI = 0.93–3.39, p = 0.082) were included in the final model (smallest AIC value = 600.81) for the development of the nomogram (Table 2).