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Purpose:Intraoperation autologous blood transfusion is an effective method that is used in surgeries with an important blood loss.Several studies suggest that massive blood transfusion is one of the independent risk for postoperative cognitive dysfunction (POCD).Whether the autologous blood is one of the risk factor for POCD or not? We retrospectively examined the incidence of POCD and the probable risk factors in patients undergoing lumbar surgery in our hospital, with the same aged non-POCD patients as controls.