Evaluation of several studies of the Clinic for Anesthesiology and Intensive Care Medicine CCM/CVK/CBF to create a register with the delirium data from anesthesiology study patients between 18 - 100 years. The primary purpose of the register is to assess factors influencing the development of delirium. In a subproject, risk factors that may lead to the development of postoperative delirium in the elderly will be evaluated with regard to gender differences using patients from the age of 60 with different surgical procedures. The risk factors examined are based on the evidence-based and consensus-based recommendations of the ESA guideline and literature review. In addition, the delirium incidence rate and the delirium severity is examined regarding gender differences.