Table 3.

Univariate and multivariate linear regression models with 25(OH) vitamin D as the dependent variable

Predictors	Univariate analysis		Multivariate analysis
	Coefficient	P value	Coefficient	P value
Age at TDM	− 0.959	< 0.001***	− 0.934	< 0.001***
Sex
Female	Reference		Reference
Male	5.958	< 0.001***	4.370	< 0.001***
Season
Spring	0.379	0.785	− 0.219	0.859
Summer	4.213	< 0.001***	3.162	0.002**
Autumn	3.497	0.010*	2.632	0.030*
Winter	Reference		Reference
MPA AUC0–24h	0.040	< 0.001***	0.034	< 0.001***
Glucocorticoid daily dose	− 0.094	< 0.001***	− 0.101	< 0.001***
Vitamin D3 supplements	4.834	0.002**	4.946	< 0.001***
Vitamin D receptor activators	− 2.768	0.003**	− 1.089	0.206

TDM therapeutic drug monitoring, MPA mycophenolic acid, AUC_0–24h area under the MPA concentration–time curve over 24 h

***P < 0.001, **P < 0.01, *P < 0.05