Fig. 2.
Comparison of serum magnesium concentrations at the preoperative and immediate postoperative periods between the control group (blue) and the magnesium group (red). The control group included patients who received intravenous normal saline as control. The magnesium group included patients who received intravenous magnesium. Each circle indicates the serum magnesium concentration of an individual patient. The horizontal lines inside the box plots indicate median values; the upper and lower edges of the box represent the third and first quartiles, respectively.