ALB and dementia: In the top 15 influential factors based on the mean absolute SHAP value, the CatBoost and XGBoost models had the same combination for the 14 features: dementia, age ≥85 years, age 74‐85 years, gastrointestinal cancer, albumin <3.5 g/dL, open surgery, male sex, hemoglobin <11 g/dL, low income, nonhome admission, Barthel Index at admission ≤60, BMI <18.5 kg/m2, diabetes, and stage III–IV (Figure 4).