PTH and Hypocalcemia: For hypocalcaemia, univariate analysis (Table 3) showed that female gender (OR = 0.412, 95% CI: 0.166–1.026, P = 0.05), surgery type (OR = 2.150, 95% CI: 1.009–4.579, P = 0.047), CCND (OR = 2.206, 95% CI: 1.035–4.704, P = 0.041), parathyroid tissue in surgical specimen (OR = 3.137, 95% CI: 1.549–6.352, P = 0.001) and POD 1 PTH level less than 10 pg/mL (OR = 10.70, 95% CI: 4.89–23.47, P = <0.0001) were significant predictors of postoperative hypocalcaemia.