The mean ( SD ) rate of blood glucose decrease until a level of 250 mg/dL or less is reached ( 45.1 [ 17.6 ] vs 52.2 [ 23.4 ] mg/dL/h ) and the mean ( SD ) time taken to achieve this target ( 6.0 [ 3.3 ] vs 6.2 [ 2.2 ] hours ) were similar in the low - and standard-dose groups , respectively .