Effect of calcium supplementation on severe hypocalcemia in patients with secondary hyperparathyroidism after total parathyroidectomy

Table 1 Patient characteristics

	All patients (n = 271)	Conventional CS group (n = 145)	Preventive CS group (n = 126)	P value
Male (n)	156 (57.6%)	95 (65.5%)	61 (48.4%)	0.489
Age (yr)	47.7 ± 11.1	47.4 ± 11.4	48.1 ± 10.7	0.577
BMI (kg/m2)	22.9 ± 3.8	23.2 ± 4.0	22.7 ± 3.7	0.407
Preoperative iPTH levels (pg/mL)	1838.61 ± 933.60	1773.38 ± 934.49	1932.33 ± 928.01	0.143
Preoperative serum calcium amounts (mmol/L)	2.58 ± 0.24	2.60 ± 0.25	2.55 ± 0.22	0.075
Preoperative serum phosphorus levels (mmol/L)	2.24 ± 0.57	2.24 ± 0.60	2.22 ± 0.53	0.775
Preoperative calcium-phosphorus ratio	5.75 ± 1.52	5.81 ± 1.58	5.67 ± 1.45	0.444
Preoperative ALP amounts (U/L)	412.22 ± 415.14	409.18 ± 399.46	416.58 ± 438.28	0.878

CS: Calcium supplementation; BMI: Body mass index; iPTH: Intact parathyroid hormone; ALP: Alkaline phosphatase.