Corresponding analysis of ROC curves showed differences between groups at 30min ( AUC = 0722 , P = 0012 ) , 90min ( AUC = 0747 , P = 0005 ) , 150min ( AUC = 0803 , P < 0001 ) and 210min ( AUC = 0849 , P < 0001 ) after surgery , and at 07.00 hours on postoperative day 1 ( AUC = 0710 , P = 0017 ) .