Data collection
anaemia, delirium, agitation, Comorbidity, diabetes
ANAEMIA, HYPERTENSION, CARDIAC DISEASE, DIABETES
The patient characteristics, including age, sex, weight, height, education, and ASA classification, were registered before the operation. In addition, the comorbidities of patients (hypertension, diabetes, anaemia, cardiac disease, etc.) were measured by the Charlson Comorbidity Index (CCI) score [Secondary outcomes were recovery time from general anaesthesia and whether waking agitation occurred. Specifically, the Riker Sedation-agitated Scale was used to evaluate delirium during recovery from general anaesthesia, and the proportion of agitation in each group was assessed according to two categories: nonagitated (levels 1–4) and agitated (levels 5–7) [