Figure 1

Univariate regression analysis between metabolic variables of interest and vitamin D levels. Individual data represent continuous variables. Regression coefficients were calculated by the general linear model on individual log-transformed values after controlling for age, BMI and gender. For abbreviations: 25(OH)D₃, 25-hydroxyvitamin D; HbA_1c, Glycated Haemoglobin; PTH, Parathyroid Hormone; OGTT, Oral Glucose Tolerance Test; HDL-CHO, HDL Cholesterol.