Table 6.

Factors associated with calcitriol: univariate and multivariate regression analyses using calcitriol as the dependent variable

Independent Variables	M3			M12
	β coefficient	P	R2	β coefficient	P	R2
Univariate models
PTH	6.53	0.097	0.06	0.2	0.92	0
FGF-23	−9.45	0.023	0.11	−10.6	0.004	0.19
Calcidiol	0.04	0.89	0	0.22	0.18	0.04
Alkaline phosphatases	0.086	0.006	0.15	0.023	0.53	0.01
eGFR	0.26	0.35	0.02	0.56	0.006	0.17
Multivariate
PTH	11.54	0.0034	-	-	-
FGF-23	−14.1	0.0009	−10.6	0.004	0.19
Overall model	0.001	0.26

Parameters included in the model: serum albumin-corrected calcium, phosphorus, PTH, FGF-23, calcidiol, calcitriol alkaline phosphatases, and eGFR. PTH and FGF-23 were Ln-transformed for regression analyses. Only parameters univariately associated at P ≤ 0.2 for at least one time point are mentioned in the table.