Fig. 2From: Preoperative vitamin D level is significantly associated with hypocalcemia after total thyroidectomy Postoperative parathyroid hormone (PTH) levels according to preoperative 25-OHD levels. * P < 0.05 compared with 25-OHD 10–20 ng/mL; # P < 0.05 compared with 25-OHD 20–30 ng/mL; ※ P < 0.05 compared with 25-OHD > 30 ng/mLBack to article page