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

Table 6 Multivariate analysis of risk factors for severe hypocalcemia in patients with preoperative alkaline phosphatase > 500 U/L

	Multivariate
	OR	95%CI	P value
Sex			0.142
Female	Ref
Male	2.610	0.726-9.380
Age	0.993	0.938-1.050	0.795
Preoperative iPTH levels	1	0.999-1.001	0.965
Preoperative ALP amounts	1.001	0.999-1.003	0.202
Preoperative serum phosphorus concentration	3.851	0.094-157.237	0.877
Preoperative calcium-phosphorus ratio	0.848	0.227-3.168	0.973
CS regimen
Conventional CS	Ref
Preventive CS	0.147	0.038-0.562	0.005

OR: Odds ratio; CI: Confidence interval; iPTH: Intact parathyroid hormone; ALP: Alkaline phosphatase; CS: Calcium supplementation; Ref: Reference.