Figure 2.

Adjusted medical cost categorised by patient characteristics and comorbidities. Since multiple imputation (MI) for missing values was not conducted for subgroup analyses due to time constraints, the total number of patients in each subgroup was not consistent with those in the main analysis where missing values were imputed using MI. ADL, activities of daily living; GA, general anaesthesia; ICU, intensive care unit; LA, light anaesthesia; n, number of patients; NA, no anaesthesia; PIM, potentially inappropriate medication.