Figure.

Patient grouping according to the analyses carried out: No patient received specific treatment for delirium prevention. For this reason, the data of those shown in the dark-olive boxes were used as a study sample (n = 178) to determine factors predictive of postoperative delirium. The patient groups in the dashed boxes (n = 114) were both treated during the same study period, so their data were used to determine the effect of intervention.

^*Patients admitted to the wards were included in the study if they were over 70 years old, showed no clinical signs of delirium, and were able to understand the study and consent to participate. Patients were excluded if they had advanced dementia if they were unable to give consent due to advanced dementia, if they were already suffering preoperatively from severe delirium, refused on principle to participate in any study, or were in the terminal stage of their disease