We randomly assigned children ( @ years of age ) who were admitted to the pediatric intensive care unit ( ICU ) and were expected to require mechanical ventilation and vasoactive drugs for at least @ hours to either tight glycemic control , with a target blood glucose range of @ to @ mg per deciliter ( @ to @ mmol per liter ) , or conventional glycemic control , with a target level below @ mg per deciliter ( @ mmol per liter ) .