Patients in the IIT group received more insulin ( 130 ( 68 to 251 ) IU versus 74 ( 13 to 165 ) IU in the control group , P = 0.01 ) , had a significantly lower morning blood glucose level ( 5.9 ( 5.1 to 6.7 ) mmol.L ( -1 ) versus 6.5 ( 5.6 to 7.2 ) mmol.L ( -1 ) , P < 0.001 ) in the first 5 days after ICU admission .