“…On the basis of previous studies, data related to demographic or perioperative variables known to be related to postoperative renal dysfunction were collected ( Table 1 ) [ 6 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 19 , 20 , 21 , 22 , 23 ]. The following perioperative clinical variables were collected: patient demographics, medical history, medication history, baseline laboratory finding, surgery type, operation time, type of anesthesia, intraoperative fluid and colloid administration, intraoperative transfusion amount, and intraoperative hemodynamic variables.…”