Association of serum resistin with diabetes and obesity in critically ill patients. (a) Serum resistin levels do not differ between patients with or without pre-existing diabetes mellitus. (b) Serum resistin levels are not associated with obesity as defined by a body mass index of more than 30 kg/m2. Box plots are displayed, where the bold black line indicates the median per group, the box represents 50% of the values, and horizontal lines show minimum and maximum values of the calculated non-outlier values; open circles indicate outlier values. ns = not significant.