A common complication after surgery is a temporary state of confusion called postoperative delirium (PD), affecting particularly elder patients. Prior studies found risk factors for PD, that are present preoperatively, e.g. older age, cognitive impairment, sensory impairment, surgical intervention-related factors, or the postoperative care. However, the preoperative risk of PD is not screened routinely as it is time-consuming and requires trained personnel.