	Calcium level at 1st POD	Number	Mean ± SD	P-value
Postoperative iPTH 1 h	NORMOCALCEMIA	49	38.63 ± 11.977	<0.05
Postoperative iPTH 1 h	HYPOCALCEMIA	18	7.78 ± 3.059	<0.05
Post-operative iPTH 4 h	NORMOCALCEMIA	49	37.20 ± 12.290	<0.05
Post-operative iPTH 4 h	HYPOCALCEMIA	18	6.44 ± 2.640	<0.05
Post-operative iPTH 24 h	NORMOCALCEMIA	49	38.08 ± 13.315	<0.05
Post-operative iPTH 24 h	HYPOCALCEMIA	18	4.94 ± 2.209	<0.05