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

Table 4 Multivariable analysis of risk factors for severe hypocalcemia in all patients

	Multivariate
	OR	95%CI	P value
Sex			0.447
Female	Ref
Male	1.275	0.682-2.381
Age	0.994	0.963-1.025	0.684
Preoperative iPTH levels	1.001	1.000-1.001	0.009
Preoperative ALP amounts	1.002	1.001-1.003	0.002
Preoperative serum phosphorus concentration	8.729	1.518-50.216	0.015
Preoperative calcium-phosphorus ratio	0.577	0.306-1.087	0.089
CS regimen
Conventional CS	Ref
Preventive CS	0.132	0.067-0.261	< 0.001

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