Table 3.

Predictors of Serum Calcium and Urinary Calcium: Creatinine Ratio, using Multiple Linear Regression Model.

Dependent variable at follow-up	Predictors	B	Standardized Coefficients (β)	P-Value	95% Confidence Interval
Serum calcium (mmol/L)	Model (R2 = 0.35)
	Age	0.001	0.11	<0.001*	0–0.001
	Gender	−0.006	−0.04	0.01*	−0.011--0.001
	Calcium baseline	0.49	0.53	<0.001*	0.458–0.517
	Serum 25(OH)D (nmol/L)	−9.07E-5	−0.03	0.04*	0.000–0.000
	Vitamin D dose (IU/d)	−8.36E-7	−0.04	0.02*	0.000–0.000
	BMI (kg/m2)	0.001	0.04	0.01*	0–0.001
Urine calcium: creatinine ratio (mg/mg)	Model (R2 = 0.16)
	Age	0	0.09	0.05*	0–0.001
	Gender	−0.01	−0.08	0.07	−0.024–0.001
	Calcium baseline (mmol/L)	0.06	0.07	0.1	−0.013–0.135
	Serum 25(OH)D (nmol/L)	0	0.07	0.09	0.000–0.000
	Vitamin D dose (IU/d)	1.35E-7	0.006	0.8	0.000–0.000
	BMI (kg/m2)	−0.001	−0.07	0.1	−0.002–0.000
	Urine calcium:creatinine Baseline	0.35	0.34	<0.001*	0.261–0.433