Frequencies of arterial blood glucose within target range. Shown are the relative frequencies of arterial blood glucose concentrations within the specified ranges, determined at 4-hour intervals. The frequencies of blood glucose levels below and above the predefined blood glucose target values were significantly increased in the 3.5 to 6.5 mmol/l compared with the 5 to 8 mmol/l group in the surviving patients (upper panel) and the patients who died (lower panel). In both groups, the majority of blood glucose values were within the target range. *P < 0.05, Mann-Whitney rank-sum test.