Fig. 1.
Vitamin D levels before and after surgery. Graph shows group mean 25 hydroxyvitamin D levels with SDs (error bars) at five perioperative time points. Time points: t0, preoperative; t1, pediatric intensive care unit (PICU) admission; t2, 4–8 h after PICU admission; t3, morning postoperative day 1; t4, morning postoperative day 2.