In the whole cohort , perioperatively initiated TGC markedly reduced the number of postoperative complications ( 23.2 % vs 34.1 % , 95 % confidence interval [ CI ] , 0.60-0 .78 ) despite only minimal improvement in glucose control ( blood glucose , 6.6 0.7 vs 6.7 0.8 mmol/L , P < .001 ; time in target range , 39.3 % 13.7 % vs 37.3 % 13.8 % , P < .001 ) .