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• W2945288596 abstract "While the inverse relationship between serum ionized calcium (Ca2+) and PTH is well-established, the relationship between 25(OH)D and PTH showed conflicting results. The study aimed to evaluate the relative contributions of age, sex, serum Ca2+, ionized magnesium (Mg2+), 25(OH)D and 1,25(OH)2D in regulating PTH secretion in healthy subjects.This is a secondary analysis of an observational study performed from March 2014 to July 2015 carried out in 2259 blood donors (1652 men and 607 women, age range 18-68 years). Subjects with parathyroid disorders and taking drugs that affect mineral metabolism were excluded.Significant correlations [between Ca2+ and PTH (r = -0.223, p < 0.001), 25(OH)D and PTH (r = -0.178, p < 0.001) and between PTH and age (r = 0.322, p < 0.001)] were found. As a preliminary step to multivariate analysis, a regression tree analysis was performed using PTH as response variable and age, Ca2+, Mg2+, 25(OH)D, 1,25(OH)2D and sex as explanatory variables to determine the effect of each covariate on the response variable. For subjects <38 years, 25(OH)D was the most important parameter in regulating PTH. For subjects ≥38 both 25(OH)D and Ca2+ levels regulated PTH secretion. Subjects with 25(OH)D < 13 ng/mL had average higher PTH; in this group only, subjects with Ca2+ ≥ 1.30 mmol/L had average lower PTH compared to subjects with Ca2+ < 1.30. The multivariate analysis showed that all variables had a significant effect (p < 0.001) on PTH. Anova Type III errors c indicated that 25(OH)D accounted for 32.1% of the total variance in PTH, Ca2+ accounted for 18% of the total variance, BMI for 14.3%, and 1,25(OH)2D for 11.1%. The remaining percentage was attributable to age and sex. This was confirmed by the regression tree approach, where 25(OH)D and Ca2+ accounted for the largest variation in the average levels of PTH.Under stable conditions 25(OH)D plays a significant role in regulating PTH secretion. Under conditions of relative vitamin D sufficiency, Ca2+ also plays an important role." @default.
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• W2945288596 date "2019-08-01" @default.
• W2945288596 modified "2023-10-02" @default.
• W2945288596 title "The relative influence of serum ionized calcium and 25-hydroxyvitamin D in regulating PTH secretion in healthy subjects" @default.
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• W2945288596 doi "https://doi.org/10.1016/j.bone.2019.05.029" @default.
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