After adjusting for other significant factors, low preoperative adjusted Ca [ß coefficient = −17.7, odds ratio = 0.001 (95 % CI: 0.001–0.502), p = 0.041] and low PTH-SC [ß coefficient = 2.063, odds ratio = 7.872 (95 % CI: 2.239–27.669), p = 0.001] were the two independent variables associated with hypocalcemia. The gene discussed is PTH; the disease is Hypocalcemia.